[Xmonad] darcs patch: add clear window message in Mosaic. (and 1 more)

The interesting one here is the myclearWindow message, which allows you to undo any resizing you've done (which is handy when you've got all too many resized windows). David Wed May 16 10:55:18 PDT 2007 David Roundy * add clear window message in Mosaic. Wed May 16 10:55:54 PDT 2007 David Roundy * make Mosaic even less picky by default.