[GHC] #9594: Cleanup of filepath package

[GHC]

#9594: Cleanup of filepath package
-------------------------------------+-------------------------------------
       Reporter:  thomie             |                   Owner:
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  libraries (other)  |                 Version:  7.9
       Keywords:  filepath           |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:  #8752              |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 I did a general cleanup/refactoring of the filepath package.

 Notable changes:
 * 10% less code
 * 2 tiny bug fixes
 * a few extra tests
 * some more documentation

 The commits are in my  [https://github.com/thomie/filepath/commits/cleanup
 cleanup branch] on Github.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9594>
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