[GHC] #3843: Merge plugins into HEAD

[GHC]

#3843: Merge plugins into HEAD
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    Reporter:  dreixel           |        Owner:  simonpj     
        Type:  task              |       Status:  new         
    Priority:  normal            |    Milestone:  7.2.1       
   Component:  Compiler          |      Version:  6.13        
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by batterseapower):

 I've merged thoughpolice's doc changes and asked Ian to put them in 7.2.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3843#comment:42>
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