[Xmonad] darcs patch: log errors on executeFile in restart

[nburlett at blizzard.ghs.com]

Wed May 30 10:10:24 PDT 2007  nickburlett at mac.com
  * log errors on executeFile in restart
  
  I found it difficult to track down a problem in the restart code where xmonad was silently not restarting. This will log the error to stderr, which should show up in .xsession-errors
  
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