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tiffcrop: added test for assumption on composite images fixes #496ff

Su Laus requested to merge Su_Laus/libtiff:tiffcrop_composite_image_assumption_test_fix#496 into master

tiffcrop: For composite images with more than one region, the combined_length or combined_width always needs to be equal, respectively. Otherwise, even the first section/region copy action might cause buffer overrun. This is now checked before the first copy action.

Closes #496 (closed), #497 (closed), #498 (closed), #500 (closed), #501 (closed).

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