* Python wrapping process moved away from src/Makefile to

  * Python wrapping process moved away from src/Makefile to
        newly created python/Makefile (as well as gdcm.i)
      * python/demo/test.py (that mirrors Test/test.cxx) is effective.
      * src/gdcmHeader::FindLength only looks for current vr when necessary.
      * src/gdcmDictSet.cxx: the dictionnaries directory path is now imported
        from the environement variable GDCM_DICT_PATH (when existing).
      * src/gdcmDict::GetTag bug fix.   --- Frog