TMI: Crawling towards doneness

Still "almost" ready to submit the pull request of doom that implements extern mod foo = something/interesting;. I got all tests passing, then (again, against my better judgment) started cleaning up some stuff, and totally broke filesearch in the process (changing it back to walk directories non-recursively instead of recursively, because I realized installing a library from a package with ID a/b/c as somedir/lib/a/b/libc-xxxxxx-x.x.dylib would be a mistake).

Not very interesting today, hopefully tomorrow will be more interesting.