Install codes and example models

[rogiersbart]

Currently rmf_install() (seems to be broken, and) puts the codes in C:/WRDAPP. I would like to revert back to installing in the system.file(package = "RMODFLOW") folder to avoid interfering with the user file system, and make the package behave more friendly under other OSs.

Furthermore, I'd like the function to "install" example models as well. I included some ModelMuse examples in the past, but I think it is more appropriate if these are not installed at package installation, but rather when it is asked for explicitly. I also thought about including examples in a separate package (e.g. RMODFLOW.examples), but I'd rather do it through this function, as we could then probably also make use of such example models in the function documentation and vignettes.

[rogiersbart]

Some candidate example models available online / useful links:

• those that come with the codes,
• http://www.ce.utexas.edu/prof/maidment/gradhydro2005/groundwater/bartonsprings.htm
• https://pubs.usgs.gov/pp/1766/
• https://pubs.usgs.gov/pp/1711/
• https://pubs.usgs.gov/sir/2010/5180/
• https://pubs.er.usgs.gov/publication/sir20145213
• https://water.usgs.gov/GIS/metadata/usgswrd/XML/wgnhs-2016_Dane_County.xml
• https://pubs.er.usgs.gov/publication/sir20165080
• https://water.usgs.gov/GIS/metadata/usgswrd/XML/sir2016-5080_usgsdatarelease.xml
• https://pubs.er.usgs.gov/publication/sir20185038
• https://water.usgs.gov/GIS/metadata/usgswrd/XML/sir2018-5038.xml
• https://www.sciencebase.gov/catalog/item/5a60f570e4b06e28e9c1d463
• https://water.usgs.gov/lookup/getgislist
• https://data.usgs.gov/datacatalog/#fq=dataType%3A(collection%20OR%20non-collection%20OR%20supercollection)&fq=dataType%3A(collection%20OR%20non-collection)&q=usgsgroundwatermodel

Other codes that might be of interest for interfacing with (and which would require installation through rmf_install()):

• https://pubs.usgs.gov/tm/06A28/
• https://www.usgs.gov/software/zonebudget-a-program-computing-subregional-water-budgets-modflow-groundwater-flow-models