Log Message:
Upgrade xmonad from 0.6 to 0.7

Changes in core since 0.6

 -- Added a startupHook field to the xmonad configuration record, which is
   an arbitrary X () action to be run each time xmonad starts (including
   restarts with mod-q). 
 -- More tests! 
 -- Improved documentation! 
 -- SIGPIPE is now ignored. 
 -- mod-shift-tab added to default keybindings, to cycle backwards through
    windows 
 -- Finally killed bug #111 dead! (#111 caused problems which were especially
 -- noticeable when clicking on tabs in a tabbed layout). 
 -- Added a 'stringProperty' query that can be used in manageHooks to match
    on any text property of a window.

More changes can be found on
http://haskell.org/haskellwiki/Xmonad/Notable_changes_since_0.6