- 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

because I failed to work out how to merge Mark's stuff -- HELP!!!

* install into paraview-3.3 instead of ParaView3.X.x for consistency with LD_LIBRARY_PATH