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EXIF 2.3.1 and GPS tags and functionality upgraded.

Su Laus requested to merge (removed):EXIF231_GPS_upgrade into master
  • Existing EXIF field definition of tags is upgraded to EXIF version 2.3.1
  • EXIF-GPS structure, tags and access functions are added as special CustomDirectory (like it was done for EXIF).
  • 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.
  • Reading error for FileSource and SceneType tags corrected. (see Merge Request !36 (closed))

Amended files tif_dirinfo.c, tif_dirread.c, tiff.h, tiffio.h, tif_dir.h, tif_dir.c

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