[Xmonad] darcs patch: color focussed tab differently. (and 2 more)

The important one here is the Decoration fix in the middle below. This makes the tabbed layout (or anything else using Decorations) respond to both expose and buttonPress events properly. David Sun Jun 10 12:57:43 PDT 2007 David Roundy <droundy@darcs.net> * color focussed tab differently. Sun Jun 10 13:34:51 PDT 2007 David Roundy <droundy@darcs.net> * make Decoration set the input mask appropriately. Sun Jun 10 13:35:13 PDT 2007 David Roundy <droundy@darcs.net> * tune layout of Tabbed just a bit.