- only create (and remove) case.OpenFOAM file if it doesn't already exist
- new -touch option just generates case.OpenFOAM file and exits
- new -region option to create case=regionName.OpenFOAM file
(the delimiter may change in the future)
- removed legacy foamDiffSourceList, foamPackChanged
- added foamPackDoxygen for separate distribution of docs
handles -prefix option
- misc. cosmetic changes