* python/gdcm.i: added a typemap that converts a C++ hashing table

  * python/gdcm.i: added a typemap that converts a C++ hashing table
        to native Python dictionary.
      * python/demo/test.py:
        - now uses the native dictionary for exploration of gdcmHeader.
        - takes an optional filename argument (the file to parse).
      * src/gdcm.h and gdcmHeader.cxx: gdcmHeader now has an accessor on
        PubElVals hashing table.
      * Dicts/dicomV3.dic removed error prone trailing spaces.  --- Frog