* src/gdcmHeader.[cxx|h]:

* src/gdcmHeader.[cxx|h]:
      - Predicates on the Transfer syntax (of the form Is[JPEF|RLE]*)
        and related, moved away to gdcmDocument.
      - Accessors (on the form [Get|Set]Entry*) set up to expose publicly
        the corresponding protected accessors of inherited class
        gdcmDocument, removed ! As a consequence gdcmFile had to be
        declared friend of class gdcmDocument (see below).
      - operator< moved to gdcmDocument (in fact it belongs to gdcmDicomDir).
      - Clean up of undefined or unused methods.
    * src/gdcmFile.[cxx|h]: added SetEntryByNumber (in order to take into
      account the changes to gdcmHeader.h).
    * src/gdcmDocument.h:
      - gdcmFile is now a friend class (in order to take into account the
        changes to gdcmHeader.h).
      - Predicates on the Transfer syntax (of the form Is[JPEF|RLE]*) added
        (see changes to gdcmHeader.h).
      - Accessors (reading on the form GetEntry*) are now public.
      - Clean up of undefined or unused methods.
    * src/gdcmDocument.cxx:
      - adaptation to changes to gdcmDocument.h
      - ::OpenFile now writes a verbose message when file cannot be opened.
      - some std::string properly set to VRKey
    * src/gdcmDicomDir.h: historical references to gdcmHeader changed to
      references to gdcmDocument.
    * Test/TestFindTags.cxx: changed accordingly to above changes.
    * gdcmPython/testSuite.py: adapted to renaming of acr files in
      cvs repository gdcmData.