[GHC] #2865: Add more autocompletions in GHCi for :set and :show

[GHC]

#2865: Add more autocompletions in GHCi for :set and :show
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Reporter:  salty-horse       |          Owner:                  
    Type:  feature request   |         Status:  new             
Priority:  normal            |      Component:  GHCi            
 Version:  6.11              |       Severity:  trivial         
Keywords:                    |       Testcase:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 GHCi already has tab completions for several :set options, but not all of
 them.
 :show also has a limited number of options and could be completed.

 The (untested) attached patch addresses both issues.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2865>
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