[GHC] #2652: fancier prompts for ghci

[GHC]

#2652: fancier prompts for ghci
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    Reporter:  jsnx              |       Owner:                  
        Type:  feature request   |      Status:  new             
    Priority:  normal            |   Component:  Compiler        
     Version:  6.8.3             |    Severity:  normal          
    Keywords:                    |    Testcase:                  
Architecture:  Unknown/Multiple  |          Os:  Unknown/Multiple
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 It'd be nice to put newlines in a GHCi prompt using standard escape
 sequences.

 It is really unnecessary to support anything more than `%s` as a
 formatting directive.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2652>
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