[xmonad] darcs patch: Prompt.Shell: escape ampersand

[Valery V. Vorotyntsev]

Rationale:

Emails that come from Windows(r)Land can have the files with funny
names attached to them...

The one I recived today was named `UMC HLRs&numbers_20090212.xls'.
I couldn't open it from xmonad's shell prompt -- the latter
tab-completed filename to

  oocalc /tmp/UMC\ HLRs&numbers_20090212.xls

The command failed since ampersand was not escaped.

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Have fun!

--
vvv