[xmonad] Two patches related to XMonad.Prompt

[Norbert Zeh]

Hi folks,

I really got used to using emacs ido mode, which offers a pretty powerful
and intuitive fuzzy matching of completions, so I wanted to port the same
to XMonad.Prompt.  This required two patches, included in the attached
patch bundles:

(1)  Completions should be sortable by how well they match the current
query string.  This turned out to be a very easy addition of a 'sorter'
function to XPConfig, which is parameterized by the current query string.
The default is 'const id', that is, no sorting is done, which is exactly
the old behaviour of XMonad.Prompt.

(2)  A new module XMonad.Prompt.FuzzyMatch that implements the fuzzy
matching.  The exact rules for matching and sorting of matches are
explained in its documentation.

As usual, let me know if anything needs to straightened out before these
patches can be applied.

Cheers,
Norbert
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