[xmonad] spawn command when no completion is available (if alwaysHighlight is True); changes commandToComplete in Prompt/Shell to complete the whole word instead of using getLastWord

[Carlos López Camey]

This small patch addresses
http://www.haskell.org/pipermail/xmonad/2013-February/013512.html.

The new behaviour also affects users that have alwaysHighlight set to
False (the default) in the following way:

 - "xterm -e emacs" autocompleted to e.g.
["emacs","emacs23","emacs-24.2",..] before (using the last word)
 - "xterm -e emacs" autocompletes to nothing now

which I'm not sure is a problem.

Best,

Carlos
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