Doing some cleanups...

[Christopher Roy Bratusek <zanghar freenet de>]

Hi all,

I'm doing some cleanups while we're in freeze (in fact I always did, but this time it
will be noticeable). There's already some re-structuring in sawfish.gtk.*, which won't
hurt anyone.

More noticeably: old-window-menu and 3d-hack are gone. Well, they are now available from
the wiki, if there's really someone using them.

Chris