[Xmonad] darcs patch: clean up TwoPane to work on Stacks as it... (and 1 more)

Last, but not least, here's my patch to make XMonadContrib work with generic Layouts (or whatever you call them). Mostly trivial, but depends on the cleanup of TwoPane that I made (which is why I made it, as you might guess, as it was, TwoPane would have had to be a Layout Window, which would be ugly). David Tue Jun 19 08:09:28 PDT 2007 David Roundy <droundy@darcs.net> * clean up TwoPane to work on Stacks as it ought. Tue Jun 19 08:10:00 PDT 2007 David Roundy <droundy@darcs.net> * update contrib to deal with generic layouts.