[Xmonad] darcs patch: simplify StackSet.delete (and 2 more)

[David Roundy]

Sorry, I forgot to send this earlier.  These are the changes needed to
support sticky windows.

David

Sun Jun 24 07:48:54 PDT 2007  David Roundy <droundy at darcs.net>
  * simplify StackSet.delete

Sun Jun 24 07:59:31 PDT 2007  David Roundy <droundy at darcs.net>
  * make delete work when window is in multiple workspaces.

Sun Jun 24 08:02:08 PDT 2007  David Roundy <droundy at darcs.net>
  * fix apparent memory leak when floating windows are deleted.

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