[xmonad] Prompt.RunOrRaise

[Justin Bogner]

This patch implements a prompt which runs an application if it's not 
running, raises the existing one if it is running, or opens a file using 
xdg-open (which selects a preferred application) if you select something 
that isn't executable. The implementation is a little hairy, and code 
cleanup would be very welcome. Let me know what you think.
_____
Justin Bogner

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