Tiff: added isBigEndian and getDirectoryOffset methods to the class * scripts/io/Tiff.m: added isBigEndian and getDirectoryOffset methods to the class. * libtinterp/corefcn/tiff.cc: added __tiff_is_big_endian__ and __tiff_get_directory_offset__ as internal functions for isBigEndian and getDirectoryOffset repectively. * scripts/image/private/__tiff_imfinfo__.m: used the two new methods to get the corresponding info fields.

root = true

[*]
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[*.{am,mk}]
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