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Some kodak files are very

Some kodak files are very special in respect of thumbnails:
- the thumbnails are actually RAW data
-unpack_thumb() process them
- thumbnail.tformat is BITMAP for these images, not JPEG

Also, LibRaw 0.17 (alpha) has fixed several bugs relates to kodak thumbs.

- upgrade to 0.17 (or Github master branch)
- ensure, that you handle thumbnail.tformat right

-- Alex Tutubalin @LibRaw LLC