[xmonad] darcs patch: Script callbacks for hooks

[Trevor Elliott]

Hi Everyone,

I've added the ability to call a script with an argument to direct
execution.  For example, if you'd like to run a hook on startup that
does something like manage your dzen2 instance, all you would need to do
is make sure that:

> execScriptHook "startup"

was somewhere in your startup hook definition, and the script
~/.xmonad/hooks would be called with a single argument of "startup".

--trevor
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