[GHC] #873: Add System.Directory.installFile

[GHC]

#873: Add System.Directory.installFile
----------------------------+-----------------------------------------------
 Reporter:  simonmar        |          Owner:             
     Type:  task            |         Status:  new        
 Priority:  normal          |      Milestone:  6.8        
Component:  libraries/base  |        Version:  6.4.2      
 Severity:  normal          |     Resolution:             
 Keywords:                  |     Difficulty:  Easy (1 hr)
 Testcase:  N/A             |   Architecture:  Unknown    
       Os:  Unknown         |  
----------------------------+-----------------------------------------------
Changes (by igloo):

  * testcase:  => N/A

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/873>
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