[Hackage] #197: implement cabal upgrade (installs new versions of all packages)

[Hackage]

#197: implement cabal upgrade (installs new versions of all packages)
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  Reporter:  guest               |        Owner:         
      Type:  defect              |       Status:  new    
  Priority:  normal              |    Milestone:         
 Component:  cabal-install tool  |      Version:  1.2.3.0
  Severity:  normal              |     Keywords:         
Difficulty:  normal              |   Ghcversion:  6.8.2  
  Platform:  Linux               |  
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 much like apt-get, we should have a way to upgrade all of the packages to
 the latest version.

 "cabal upgrade" is probably a good name.

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/197>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects