small typo fix in Imager::Transformations
change notes to date
[rt #86428] search a few more places for libraries/headers

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.
change note for 306618c39