find: Rather than only showing files whose contents are present, when used
with --exclude --copies or --in, displays all files that match the
specified conditions.
Note that this is a behavior change for find --exclude! Old behavior
can be gotten with find --in . --exclude=...
I dislike -( and -), but without using a different option parser, can't
easily use bare parens.
--and and --or will become more useful once there are more interesting
limits than --exclude
