also add model parameter to Imager->new()
also add a compose() method and add notes on the order of multiplcation vs composition of transformations.
but do it if the caller asks nicely
This can significantly reduce file size, but uses more memory and time. For one sample image (mostly sky), this reduced the file size from 445930 bytes to 272933 bytes, with a 12% increase in CPU usage.
Imager::Probe now searches the directories specified by LD_LIBRARY_PATH, DYLD_LIBRARY_PATH, LD_RUN_PATH and LIBRARY_PATH for libraries and their corresponding s/\blib$/include/ directory for headers.
and fix some spelling issues
as the perl core hints/linux.sh does.