SIX-2.0.3

•Fixed a bug that caused round_trip_six to not work properly with multi-segment SICDs
•Added the ability to change the SICD/SIDD XML version that's written out by round_trip_six
•Added cropSICD() / cropSIDD() functions and crop_sicd / crop_sidd applications for cropping out an AOI from a SICD/SIDD
•Fixed a bug affecting reading AOIs > 4 GB
•Fixed a bug in test_dump_images run with one read where more was allocated and written out than necessary
•Replaced all instances of 'long' and 'unsigned long' with 'sys::SSize_T' and 'size_t', respectively. This fixed at least one bug that occurred in NITFReadControl::interleaved() on Windows for AOIs > 4 GB
•Source can be downloaded from https://github.com/ngageoint/six-library/archive/SIX-2.0.3.tar.gz