[Xmonad] darcs patch: use a global IORef to keep list of urgent windows

[Devin Mullins]

Somebody asked for the ability to display which workspaces had urgent windows in them in the logHook.
Well, here it is. (Well, the core state-tracking functionality.) Please provide input on:
 - If it's bug-free (no space-leaks, safe-ish unsafePerformIO, etc.)
 - If it's useful (whoever you were that asked for it)

Sat Oct 27 02:48:10 EDT 2007  Devin Mullins <me at twifkak.com>
  * use a global IORef to keep list of urgent windows

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