added comment, removed MVM debugging cout
Adding and clarifying license info for Shapefile reader.
Removed ParaviewGeo src from RVA

ParaViewGeo was added to RVA solely because it had a shapefile reader.
At some point, RVA developers pulled out and modified this reader into a
separate directory.

Ideally, this will be completely removed if/when vtkGDALVectorReader
makes it into mainstream ParaView.