diff --git a/.Rbuildignore b/.Rbuildignore
index f34e382..bc14799 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -1,2 +1,4 @@
 ^ApsimOnR\.Rproj$
 ^\.Rproj\.user$
+^packrat/
+^\.Rprofile$
diff --git a/.Rprofile b/.Rprofile
new file mode 100644
index 0000000..cae66ba
--- /dev/null
+++ b/.Rprofile
@@ -0,0 +1,3 @@
+#### -- Packrat Autoloader (version 0.5.0) -- ####
+source("packrat/init.R")
+#### -- End Packrat Autoloader -- ####
diff --git a/.gitignore b/.gitignore
index 33b39f8..20b70c6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,6 @@
 *.db-shm
 *.db-wal
 *.apsimx.bak
+packrat/lib*/
+packrat/bundles/
+packrat/src/
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..c2369d2
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,24 @@
+language: r
+os: linux
+dist: xenial
+env: PKGVER=1.0
+install:
+- R -e "0" --args --bootstrap-packrat
+- R -e "packrat::restore(restart = FALSE)"
+script:
+- mkdir packrat/bundles
+- R -e "packrat::bundle(file = paste('packrat/bundles/ApsimOnR-', Sys.getenv('PKGVER'),
+  '.', Sys.getenv('TRAVIS_BUILD_NUMBER'), '.tar.gz', sep = ''))"
+- R CMD check *.tar.gz
+warnings_are_errors: false
+
+deploy:
+  provider: releases
+  token:
+    secure: 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
+  file: packrat/bundles/ApsimOnR-$PKGVER.$TRAVIS_BUILD_NUMBER.tar.gz
+  on:
+    repo: hol430/ApsimOnR
+    tags: true
+  skip_cleanup: true
+  draft: true
diff --git a/packrat/init.R b/packrat/init.R
new file mode 100644
index 0000000..5901a33
--- /dev/null
+++ b/packrat/init.R
@@ -0,0 +1,226 @@
+local({
+
+  ## Helper function to get the path to the library directory for a
+  ## given packrat project.
+  getPackratLibDir <- function(projDir = NULL) {
+    path <- file.path("packrat", "lib", R.version$platform, getRversion())
+
+    if (!is.null(projDir)) {
+
+      ## Strip trailing slashes if necessary
+      projDir <- sub("/+$", "", projDir)
+
+      ## Only prepend path if different from current working dir
+      if (!identical(normalizePath(projDir), normalizePath(getwd())))
+        path <- file.path(projDir, path)
+    }
+
+    path
+  }
+
+  ## Ensure that we set the packrat library directory relative to the
+  ## project directory. Normally, this should be the working directory,
+  ## but we also use '.rs.getProjectDirectory()' if necessary (e.g. we're
+  ## rebuilding a project while within a separate directory)
+  libDir <- if (exists(".rs.getProjectDirectory"))
+    getPackratLibDir(.rs.getProjectDirectory())
+  else
+    getPackratLibDir()
+
+  ## Unload packrat in case it's loaded -- this ensures packrat _must_ be
+  ## loaded from the private library. Note that `requireNamespace` will
+  ## succeed if the package is already loaded, regardless of lib.loc!
+  if ("packrat" %in% loadedNamespaces())
+    try(unloadNamespace("packrat"), silent = TRUE)
+
+  if (suppressWarnings(requireNamespace("packrat", quietly = TRUE, lib.loc = libDir))) {
+
+    # Check 'print.banner.on.startup' -- when NA and RStudio, don't print
+    print.banner <- packrat::get_opts("print.banner.on.startup")
+    if (print.banner == "auto" && is.na(Sys.getenv("RSTUDIO", unset = NA))) {
+      print.banner <- TRUE
+    } else {
+      print.banner <- FALSE
+    }
+    return(packrat::on(print.banner = print.banner))
+  }
+
+  ## Escape hatch to allow RStudio to handle bootstrapping. This
+  ## enables RStudio to provide print output when automagically
+  ## restoring a project from a bundle on load.
+  if (!is.na(Sys.getenv("RSTUDIO", unset = NA)) &&
+      is.na(Sys.getenv("RSTUDIO_PACKRAT_BOOTSTRAP", unset = NA))) {
+    Sys.setenv("RSTUDIO_PACKRAT_BOOTSTRAP" = "1")
+    setHook("rstudio.sessionInit", function(...) {
+      # Ensure that, on sourcing 'packrat/init.R', we are
+      # within the project root directory
+      if (exists(".rs.getProjectDirectory")) {
+        owd <- getwd()
+        setwd(.rs.getProjectDirectory())
+        on.exit(setwd(owd), add = TRUE)
+      }
+      source("packrat/init.R")
+    })
+    return(invisible(NULL))
+  }
+
+  ## Bootstrapping -- only performed in interactive contexts,
+  ## or when explicitly asked for on the command line
+  if (interactive() || "--bootstrap-packrat" %in% commandArgs(TRUE)) {
+
+    needsRestore <- "--bootstrap-packrat" %in% commandArgs(TRUE)
+
+    message("Packrat is not installed in the local library -- ",
+            "attempting to bootstrap an installation...")
+
+    ## We need utils for the following to succeed -- there are calls to functions
+    ## in 'restore' that are contained within utils. utils gets loaded at the
+    ## end of start-up anyhow, so this should be fine
+    library("utils", character.only = TRUE)
+
+    ## Install packrat into local project library
+    packratSrcPath <- list.files(full.names = TRUE,
+                                 file.path("packrat", "src", "packrat")
+    )
+
+    ## No packrat tarballs available locally -- try some other means of installation
+    if (!length(packratSrcPath)) {
+
+      message("> No source tarball of packrat available locally")
+
+      ## There are no packrat sources available -- try using a version of
+      ## packrat installed in the user library to bootstrap
+      if (requireNamespace("packrat", quietly = TRUE) && packageVersion("packrat") >= "0.2.0.99") {
+        message("> Using user-library packrat (",
+                packageVersion("packrat"),
+                ") to bootstrap this project")
+      }
+
+      ## Couldn't find a user-local packrat -- try finding and using devtools
+      ## to install
+      else if (requireNamespace("devtools", quietly = TRUE)) {
+        message("> Attempting to use devtools::install_github to install ",
+                "a temporary version of packrat")
+        library(stats) ## for setNames
+        devtools::install_github("rstudio/packrat")
+      }
+
+      ## Try downloading packrat from CRAN if available
+      else if ("packrat" %in% rownames(available.packages())) {
+        message("> Installing packrat from CRAN")
+        install.packages("packrat")
+      }
+
+      ## Fail -- couldn't find an appropriate means of installing packrat
+      else {
+        stop("Could not automatically bootstrap packrat -- try running ",
+             "\"'install.packages('devtools'); devtools::install_github('rstudio/packrat')\"",
+             "and restarting R to bootstrap packrat.")
+      }
+
+      # Restore the project, unload the temporary packrat, and load the private packrat
+      if (needsRestore)
+        packrat::restore(prompt = FALSE, restart = TRUE)
+
+      ## This code path only reached if we didn't restart earlier
+      unloadNamespace("packrat")
+      requireNamespace("packrat", lib.loc = libDir, quietly = TRUE)
+      return(packrat::on())
+
+    }
+
+    ## Multiple packrat tarballs available locally -- try to choose one
+    ## TODO: read lock file and infer most appropriate from there; low priority because
+    ## after bootstrapping packrat a restore should do the right thing
+    if (length(packratSrcPath) > 1) {
+      warning("Multiple versions of packrat available in the source directory;",
+              "using packrat source:\n- ", shQuote(packratSrcPath))
+      packratSrcPath <- packratSrcPath[[1]]
+    }
+
+
+    lib <- file.path("packrat", "lib", R.version$platform, getRversion())
+    if (!file.exists(lib)) {
+      dir.create(lib, recursive = TRUE)
+    }
+
+    message("> Installing packrat into project private library:")
+    message("- ", shQuote(lib))
+
+    surround <- function(x, with) {
+      if (!length(x)) return(character())
+      paste0(with, x, with)
+    }
+
+
+    ## Invoke install.packages() in clean R session
+    peq <- function(x, y) paste(x, y, sep = " = ")
+    installArgs <- c(
+      peq("pkgs", surround(packratSrcPath, with = "'")),
+      peq("lib", surround(lib, with = "'")),
+      peq("repos", "NULL"),
+      peq("type", surround("source", with = "'"))
+    )
+
+    fmt <- "utils::install.packages(%s)"
+    installCmd <- sprintf(fmt, paste(installArgs, collapse = ", "))
+
+    ## Write script to file (avoid issues with command line quoting
+    ## on R 3.4.3)
+    installFile <- tempfile("packrat-bootstrap", fileext = ".R")
+    writeLines(installCmd, con = installFile)
+    on.exit(unlink(installFile), add = TRUE)
+
+    fullCmd <- paste(
+      surround(file.path(R.home("bin"), "R"), with = "\""),
+      "--vanilla",
+      "--slave",
+      "-f",
+      surround(installFile, with = "\"")
+    )
+    system(fullCmd)
+
+    ## Tag the installed packrat so we know it's managed by packrat
+    ## TODO: should this be taking information from the lockfile? this is a bit awkward
+    ## because we're taking an un-annotated packrat source tarball and simply assuming it's now
+    ## an 'installed from source' version
+
+    ## -- InstallAgent -- ##
+    installAgent <- "InstallAgent: packrat 0.5.0"
+
+    ## -- InstallSource -- ##
+    installSource <- "InstallSource: source"
+
+    packratDescPath <- file.path(lib, "packrat", "DESCRIPTION")
+    DESCRIPTION <- readLines(packratDescPath)
+    DESCRIPTION <- c(DESCRIPTION, installAgent, installSource)
+    cat(DESCRIPTION, file = packratDescPath, sep = "\n")
+
+    # Otherwise, continue on as normal
+    message("> Attaching packrat")
+    library("packrat", character.only = TRUE, lib.loc = lib)
+
+    message("> Restoring library")
+    if (needsRestore)
+      packrat::restore(prompt = FALSE, restart = FALSE)
+
+    # If the environment allows us to restart, do so with a call to restore
+    restart <- getOption("restart")
+    if (!is.null(restart)) {
+      message("> Packrat bootstrap successfully completed. ",
+              "Restarting R and entering packrat mode...")
+      return(restart())
+    }
+
+    # Callers (source-erers) can define this hidden variable to make sure we don't enter packrat mode
+    # Primarily useful for testing
+    if (!exists(".__DONT_ENTER_PACKRAT_MODE__.") && interactive()) {
+      message("> Packrat bootstrap successfully completed. Entering packrat mode...")
+      packrat::on()
+    }
+
+    Sys.unsetenv("RSTUDIO_PACKRAT_BOOTSTRAP")
+
+  }
+
+})
diff --git a/packrat/packrat.lock b/packrat/packrat.lock
new file mode 100644
index 0000000..abfdd8d
--- /dev/null
+++ b/packrat/packrat.lock
@@ -0,0 +1,747 @@
+PackratFormat: 1.4
+PackratVersion: 0.5.0
+RVersion: 4.0.2
+Repos: CRAN=https://cran.rstudio.com/
+
+Package: BH
+Source: CRAN
+Version: 1.72.0-3
+Hash: fc53be86f0b712d3de03fef95893d710
+
+Package: BayesianTools
+Source: CRAN
+Version: 0.1.7
+Hash: 54d6dbb3f4cae09950b0fb1d11bf9a97
+Requires: DHARMa, IDPmisc, Rcpp, bridgesampling, coda, ellipse,
+    emulator, gap, msm, mvtnorm, numDeriv, tmvtnorm
+
+Package: Brobdingnag
+Source: CRAN
+Version: 1.2-6
+Hash: 543ab76a3f45b3befa35b301e0fa6b13
+
+Package: CroptimizR
+Source: github
+Version: 0.1.0.9003
+Hash: 9cc3857c7624af56d599bdc7f5f377c7
+Requires: BayesianTools, DiceDesign, coda, crayon, dplyr, lubridate,
+    nloptr, rlang, rstudioapi, tictoc
+GithubRepo: CroptimizR
+GithubUsername: SticsRPacks
+GithubRef: HEAD
+GithubSha1: b11ab5f10e4b8693870a8498bdd2c65c76992f5e
+RemoteHost: api.github.com
+RemoteRepo: CroptimizR
+RemoteUsername: SticsRPacks
+RemoteRef: HEAD
+RemoteSha: b11ab5f10e4b8693870a8498bdd2c65c76992f5e
+
+Package: DHARMa
+Source: CRAN
+Version: 0.3.3.0
+Hash: c1849995ec99bba303e5de9c4df00177
+Requires: ape, doParallel, foreach, gap, glmmTMB, lme4, lmtest, qgam,
+    sfsmisc
+
+Package: DT
+Source: CRAN
+Version: 0.15
+Hash: e0b04e956525f656276d1b938f75dd0a
+Requires: crosstalk, htmltools, htmlwidgets, jsonlite, magrittr,
+    promises
+
+Package: DiceDesign
+Source: CRAN
+Version: 1.8-1
+Hash: abd58859d6087fa1fc495803722658af
+
+Package: IDPmisc
+Source: CRAN
+Version: 1.1.20
+Hash: 68205023ba5a53c1df6e3c4e75159c54
+
+Package: R6
+Source: CRAN
+Version: 2.4.1
+Hash: b488861d8c3dfac497e041ec911df9fb
+
+Package: RColorBrewer
+Source: CRAN
+Version: 1.1-2
+Hash: c0d56cd15034f395874c870141870c25
+
+Package: Rcpp
+Source: CRAN
+Version: 1.0.5
+Hash: f6e400231df42179d6ce8fb35e52bf3f
+
+Package: RcppEigen
+Source: CRAN
+Version: 0.3.3.7.0
+Hash: 0edf6397bb355add58fdfe1b2cc858e1
+Requires: Rcpp
+
+Package: TMB
+Source: CRAN
+Version: 1.7.18
+Hash: a3d58e767822031a43cf97f2bc5ac089
+Requires: RcppEigen
+
+Package: ape
+Source: CRAN
+Version: 5.4-1
+Hash: 91a6b48fe4d1b3f80a879acdd7014d6d
+Requires: Rcpp
+
+Package: askpass
+Source: CRAN
+Version: 1.1
+Hash: 6f6c430e3cd0dd7d48f447700f4d7e7f
+Requires: sys
+
+Package: assertthat
+Source: CRAN
+Version: 0.2.1
+Hash: 622be49032fe50bd42e96aaef613e209
+
+Package: backports
+Source: CRAN
+Version: 1.1.9
+Hash: e9d52764d6a7fd022aa0d374a3f01fbe
+
+Package: base64enc
+Source: CRAN
+Version: 0.1-3
+Hash: c590d29e555926af053055e23ee79efb
+
+Package: brew
+Source: CRAN
+Version: 1.0-6
+Hash: 931f9972deae0f205e1c78a51f33149b
+
+Package: bridgesampling
+Source: CRAN
+Version: 1.0-0
+Hash: ea9d67cc683d2460edee1ad5d6d3ab96
+Requires: Brobdingnag, coda, mvtnorm, scales, stringr
+
+Package: callr
+Source: CRAN
+Version: 3.4.3
+Hash: e9b50bc56e655025fde6f2f4b65154de
+Requires: R6, processx
+
+Package: cli
+Source: CRAN
+Version: 2.0.2
+Hash: 6fc0b39f0fdbe3a025062807019e1180
+Requires: assertthat, crayon, fansi, glue
+
+Package: clipr
+Source: CRAN
+Version: 0.7.0
+Hash: 30cdec6c8cc62c80c485e6bdd0c02b05
+
+Package: coda
+Source: CRAN
+Version: 0.19-3
+Hash: a6bd401a844d5fc9e5d9589dc0197acb
+
+Package: colorspace
+Source: CRAN
+Version: 1.4-1
+Hash: 60a56e9998b8b58ee378db3dc91b27a5
+
+Package: commonmark
+Source: CRAN
+Version: 1.7
+Hash: 77f4ba718e2bad1877ef26e48cf8fa43
+
+Package: covr
+Source: CRAN
+Version: 3.5.0
+Hash: 5596e67efe91c26ce9bf7813268990fe
+Requires: crayon, digest, httr, jsonlite, rex, withr, yaml
+
+Package: crayon
+Source: CRAN
+Version: 1.3.4
+Hash: ff2840dd9b0d563fc80377a5a45510cd
+
+Package: crosstalk
+Source: CRAN
+Version: 1.1.0.1
+Hash: 0074e4967b2db46d003c5d23e4519306
+Requires: R6, htmltools, jsonlite, lazyeval
+
+Package: curl
+Source: CRAN
+Version: 4.3
+Hash: 3916ae5637dbaf5996dbde80ea92a047
+
+Package: desc
+Source: CRAN
+Version: 1.2.0
+Hash: a0a3ca939997679a52816bae4ed6aaae
+Requires: R6, assertthat, crayon, rprojroot
+
+Package: devtools
+Source: CRAN
+Version: 2.3.1
+Hash: acddc9294243decc0ebc3bae53342709
+Requires: DT, callr, cli, covr, desc, ellipsis, httr, jsonlite,
+    memoise, pkgbuild, pkgload, rcmdcheck, remotes, rlang, roxygen2,
+    rstudioapi, rversions, sessioninfo, testthat, usethis, withr
+
+Package: digest
+Source: CRAN
+Version: 0.6.25
+Hash: ec0a673866797c8c1fc1daa359fb4cad
+
+Package: doParallel
+Source: CRAN
+Version: 1.0.15
+Hash: 2d8e07c1201447e22a46552ed6664f08
+Requires: foreach, iterators
+
+Package: dplyr
+Source: CRAN
+Version: 1.0.2
+Hash: ea54da55bb8474c5f1e7852ea3315c22
+Requires: R6, ellipsis, generics, glue, lifecycle, magrittr, rlang,
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+
+Package: ellipse
+Source: CRAN
+Version: 0.4.2
+Hash: eff7b672cd820a3c6aee64e46b0c028d
+
+Package: ellipsis
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+Hash: b294fcc92985c6235df03c1c34f25e99
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+
+Package: emulator
+Source: CRAN
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+Hash: 30b522722680e893e5cfafbf009895b9
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+
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+Source: CRAN
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+
+Package: expm
+Source: CRAN
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+
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+Source: CRAN
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+
+Package: farver
+Source: CRAN
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+
+Package: fastmap
+Source: CRAN
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+
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+
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+Source: CRAN
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+Hash: 61f5414707b3f33eeca1a61c9f91cfd1
+
+Package: generics
+Source: CRAN
+Version: 0.0.2
+Hash: 4aaf002dd434e8c854611c5d11a1d58e
+
+Package: gh
+Source: CRAN
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+Hash: efbe85b24e36b328003fd33772a8931b
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+
+Package: git2r
+Source: CRAN
+Version: 0.27.1
+Hash: d0db6b4bcec242d9b2bd14e5f7e26f57
+
+Package: glmmTMB
+Source: CRAN
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+Hash: 611432a268148e8623d6af8d9b6a6300
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+
+Package: glue
+Source: CRAN
+Version: 1.4.2
+Hash: afa798ba9deec3676e20300b79094749
+
+Package: gmm
+Source: CRAN
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+Hash: f8f2d35b70b902e98a22645e9a1b6a92
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+
+Package: highr
+Source: CRAN
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+Hash: 16aa2cc98d7b68c9d148c263c8dcdbcd
+
+Package: htmltools
+Source: CRAN
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+Hash: 79070a001acba57f88692d17e859bac5
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+
+Package: htmlwidgets
+Source: CRAN
+Version: 1.5.1
+Hash: 20e5cc02b795afc7322836c947b5aab2
+Requires: htmltools, jsonlite, yaml
+
+Package: httpuv
+Source: CRAN
+Version: 1.5.4
+Hash: 8c8e24cfefa0977e389e458129cf96e3
+Requires: BH, R6, Rcpp, later, promises
+
+Package: httr
+Source: CRAN
+Version: 1.4.2
+Hash: 2ad813eba37ce1f357434789aa8b6132
+Requires: R6, curl, jsonlite, mime, openssl
+
+Package: ini
+Source: CRAN
+Version: 0.3.1
+Hash: 9d6de5178c1cedabfb24e7d2acc9a092
+
+Package: iterators
+Source: CRAN
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+Hash: f0b9003c5ffc99a96b9f21079c1715a5
+
+Package: jsonlite
+Source: CRAN
+Version: 1.7.0
+Hash: dec188bcfae1bb0fba6731c9aee6a9d2
+
+Package: knitr
+Source: CRAN
+Version: 1.29
+Hash: 092d44a49b645731ffe88d41be022f01
+Requires: evaluate, highr, markdown, stringr, xfun, yaml
+
+Package: labeling
+Source: CRAN
+Version: 0.3
+Hash: ecf589b42cd284b03a4beb9665482d3e
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diff --git a/packrat/packrat.opts b/packrat/packrat.opts
new file mode 100644
index 0000000..1ecf20c
--- /dev/null
+++ b/packrat/packrat.opts
@@ -0,0 +1,19 @@
+auto.snapshot: FALSE
+use.cache: FALSE
+print.banner.on.startup: auto
+vcs.ignore.lib: TRUE
+vcs.ignore.src: FALSE
+external.packages: 
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+load.external.packages.on.startup: TRUE
+ignored.packages: 
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+    data
+    inst
+quiet.package.installation: TRUE
+snapshot.recommended.packages: FALSE
+snapshot.fields:
+    Imports
+    Depends
+    LinkingTo
+symlink.system.packages: TRUE