* CLEANUP_ROUND (10) for gdcmPixelConvert (Xanax is my friend stage)

    The JPEG fragments are now parsed at the same stage than the RLE
    information. All code related to JPEG is now in gdcmPixelConvert:
    - src/gdcmJPEGFragment.h and gdcmJPEGFragmentsInfo.[h|cxx] added
    - src/gdcmJpeg12.cxx, gdcmJpeg2000.cxx and gdcmJpeg8.cxx no longer
      export a gdcmFile:: method. Those are simply global functions
      (for the time being this is better than having them attach to
       either gdcmFile:: or gdcmPixelConvert::).
    - src/gdcmDocument.[cxx|h], gdcmDocument:: now parser the JPEG fragments
      and stores the result in a gdcmJPEGFragmentsInfo.
    - src/gdcmFile.[cxx|h] and gdcmPixelConvert.[cxx|h]: all JPEG related
      code (among other stuff) moved away from gdcmFile:; to
      gdcmPixelConvert::