Explore VM options to deal with Rtools

[ldecicco-USGS]

smwrStats (and probably others....but not all that have dll's) require 2 different versions of Rtools depending on if you are in R version 3.3 or 3.2. I tried pointing the PATH to 2 different versions and changing that via Jenkins but that didn't seem to work.

The workflow at the moment is install Rtools for R 3.2, open RStudio with pr account, change Global Tools R to 3.2 (if not already). Then, run the src and bin builds via grantools (install via devtools, dl_build_src();build_bin())

Then, install Rtools for 3.3 and repeat.

The next time that grantools is run, there is a check to see what packages need to be re-built. So, this process should only need to be done when a few packages (smwrStats is the only one I know for sure) are updated. FYI, wvr does not need the right Rtools....it just worked with Rtools 3.4 installed.

[aappling-usgs]

maybe useful? http://stackoverflow.com/questions/37464070/install-r-rtools-from-windows-terminal