Added new commandline flags:
--rename-dupes if two files have the same name but differing case
(A.png vs a.png) rename the second as "a (1).png" to
allow both to be extracted on Windows
--super-disable only extract files unique to this IFS, do not follow
"super" parent references at all
--super-skip-bad if a "super" IFS reference has a checksum mismatch, do
not extract it
--super-abort-if-bad if a "super" IFS reference has a checksum mismatch,
cancel and display an error