os.cwd can return OSError (maybe IOError with wrong perms for ./, will test actually...

os.cwd can return OSError (maybe IOError with wrong perms for ./, will test actually), load_mod should be IMportError, nuke a stupid try except around shuffle which used to break years ago with old glibcs, remove try except around what appears to be a regex? and make the try except around the unlink a bit cleaner

svn path=/main/trunk/; revision=5587