Consider adding R

[wenzeslaus]

R is a dependency of some addon modules and it makes sense to use it together, so perhaps a separate module grass-r or something like that.

It seems that a user expectation would be that this would have rgrass pre-installed, but the trouble is that R users may need/want a lot of latest geospatial packages installed and these would likely get outdated fast.

[wenzeslaus]

Relevant issues:

• Special steps to install Rmpi within a Conda environment (module load R is already configured and the conda setup is more difficult for R than for Python)