[Xmonad] darcs patch: Main.hs: get rid off non-standard pattern guards.

[joachim.fasting at gmail.com]

Thu Jun 21 00:04:21 CEST 2007  joachim.fasting at gmail.com
  * Main.hs: get rid off non-standard pattern guards.
  Adds another import and looks a bit convoluted, but this is the best I could do.
  Also, any trailing non-numeric characters (as in --resume 9r) will be ignored,
  as this code just blindly calls fst if reads returns anything but an empty list
  (don't know if this is stupid or not).
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