[Hackage] #442: remove old packages after successful update

[Hackage]

#442: remove old packages after successful update
---------------------------------+------------------------------------------
  Reporter:  guest               |        Owner:         
      Type:  enhancement         |       Status:  new    
  Priority:  normal              |    Milestone:         
 Component:  cabal-install tool  |      Version:  1.6.0.1
  Severity:  normal              |     Keywords:         
Difficulty:  normal              |   Ghcversion:  6.10.1 
  Platform:                      |  
---------------------------------+------------------------------------------
 After a successful `cabal update` command, the old version of the package
 could be removed. (It required to rebuild/reinstall all the dependent
 packages as well. It is reported in #441 ticket.)

 I do not think it should be a default behavior, but make it possible would
 be really nice. :)

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/442>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects