The working folder holds the downloaded data (data/, about 1 GB after pm_setup()), the plate
models (models/), your points and edits (points/), the rendered maps (maps/) and the
statistics of the corrected grids (results/). The Windows launcher uses its own folder. From R the default
is the option PaleoMapR.folder, else the environment variable PALEOMAPR_FOLDER, else a folder
PaleoMapR in your home folder (on Windows: Documents).