patch applied (ghc): #1617: Add :browse! and various other additions to GHCi

[Simon Marlow]

Wed Nov  7 02:26:48 PST 2007  Simon Marlow <simonmar at microsoft.com>
  * #1617: Add :browse! and various other additions to GHCi
     
    - :browse!
      a variant of :browse that lists children separately,
      not in context, and gives import qualifiers in comments
  
  SimonM: I also added sorting by source location for interpreted
  modules in :browse, and alphabetic sorting by name otherwise.  For
  :browse *M, the locally-defined names come before the external ones.
  
    - :{ ..lines.. :} (multiline commands)
      allow existing commands to be spread over multiple lines
      to improve readability, both interactively and in .ghci
      (includes a refactoring that unifies the previous three
      command loops into one, runCommands, fed from cmdqueue,
      file, or readline)
  
    - :set
        now shows GHCi-specific flag settings (printing/
        debugger), as well as non-language dynamic flag 
        settings
      :show languages
        show active language flags
      :show packages
        show active package flags as well as implicitly 
        loaded packages
  

    M ./compiler/basicTypes/RdrName.lhs -1 +7
    M ./compiler/ghci/InteractiveUI.hs -69 +195
    M ./compiler/main/DynFlags.hs +1
    M ./compiler/main/GHC.hs +7
    M ./docs/users_guide/flags.xml -1 +1
    M ./docs/users_guide/ghci.xml -6 +75