UNDO: Ignore borders in the stored RationalRects of floating windows.
UNDO: Ignore borders in the stored RationalRects of floating windows.

Also, add 'floatWindow' which computes the actual Rectangle for that window,
including border.

darcs-hash:20071019063922-a5988-b84e68dff7ca4680220733e20158972f0f3fc46d

Happy-Ferret/xmonad