functionality to add the .prj parameters and thinking and what the
user will need to define and what can be added automatically. Added
(dirty prototypical) function to call the generateStructuredMesh.exe given the /bin path.

future, just getting used to workflow again)

user_input.R, first one contains S3 methods and second one is a small
test that should be ready to run (if the r2ogs6 package is installed and loaded)