patch applied (ghc): MERGED: Make ":" in GHCi repeat the last command

[Ian Lynagh]

Sun Nov 25 04:20:20 PST 2007  Ian Lynagh <igloo at earth.li>
  * MERGED: Make ":" in GHCi repeat the last command
  Ian Lynagh <igloo at earth.li>**20071124231857
   It used to be a synonym for ":r" in 6.6.1, but this wasn't documented or
   known about by the developers. In 6.8.1 it was accidentally broken.
   This patch brings it back, but as "repeat the last command", similar to
   pressing enter in gdb. This is almost as good for people who want it to
   reload, and means that it can also be used to repeat commands like :step.

    M ./compiler/ghci/GhciMonad.hs +5
    M ./compiler/ghci/InteractiveUI.hs -15 +34
    M ./docs/users_guide/ghci.xml +11