patch applied (ghc): Closure inspection in GHCi

[Ian Lynagh]

Sun Dec 10 15:20:18 PST 2006  Pepe Iborra <mnislaih at gmail.com>
  * Closure inspection in GHCi
  
  The :print, :sprint and :force commands for GHCi.
  This set of commands allows inspection of heap structures of the bindings in the interactive environment.
  This is useful to observe lazyness and specially to inspect things with undespecified polymorphic types, as happens often in breakpoints.
  

    M ./compiler/ghci/Debugger.hs +242
    M ./compiler/ghci/InteractiveUI.hs +5
    M ./compiler/prelude/PrelNames.lhs -1 +11
    M ./compiler/types/Type.lhs -1 +11