patch applied (ghc): let you :show things that you can :set (e.g. args, prog etc.)

[Simon Marlow]

Tue May  8 06:57:07 PDT 2007  Simon Marlow <simonmar at microsoft.com>
  * let you :show things that you can :set (e.g. args, prog etc.)

    M ./compiler/ghci/InteractiveUI.hs -4 +10