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EXIF 2.32 and GPS TIFF-tags and functionality upgraded.

Su Laus requested to merge Su_Laus/libtiff:EXIF231_GPS_upgrade into master
  • Existing EXIF TIFF tag definition is upgraded to EXIF version 2.32 (May 2019)
  • EXIF-GPS structure, tags and access functions are added as special CustomDirectory
    (like it was already done for EXIF by Frank Warmerdam in 2012).
  • Test program custom_dir_EXIF_231.c added to test writing/reading of EXID IFD and GPS IFD tags and to highlight some quirks of IFD-handling and peculiarities of reading/writing the different data types.

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