patch applied (cabal-install): Add the cabal-setup commands: configure, build etc

[Duncan Coutts]

Mon Dec 17 13:06:21 PST 2007  Duncan Coutts <duncan at haskell.org>
  * Add the cabal-setup commands: configure, build etc
  So we now have the complete set of commands in one tool.
  This uses the new Command infrastructure to do two way conversion between
  flags as strings and as a structured parsed form.

    M ./Main.hs -45 +22