Failed install - R v3.6.0 - staged install

[leppott]

Describe the bug
Staged install implemented in R v.3.6.0 is causing the package to not install.

StagedInstall: no in DESCRIPTION is a quick (temporary) fix.

Due to use of system.file(package="BioMonTools"). Probably save to a variable.

Staged install installs to temp directory and fails.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Additional context
https://developer.r-project.org/Blog/public/2019/02/14/staged-install/index.html

[leppott]

Issue with devtools and R v3.6.0 so need to add an extra line of code before installing.

r-lib/devtools#1939

Using Sys.setenv("TAR" = "internal") prior to devtools::install_gitbub("leppott/CASTfxn") seems to do the trick.

Need to add to README.

[leppott]

Works fine otherwise. That is, not issues with hard coded paths and staged install.

[leppott]

Update Badges while editing README.

[leppott]

Remove StagedInstall: no from DESCRIPTION.