patch applied (cabal): Rejig --list-options handling so it takes priority

[Duncan Coutts]

Tue Dec 18 11:16:36 PST 2007  Duncan Coutts <duncan at haskell.org>
  * Rejig --list-options handling so it takes priority
  --list-options no takes priority over errors in other flags and over --help
  this is so that it can be used consistently for command completion without
  returning garbage (ie error messages on ill formed partial command lines
  or producing --help output). Also make --list-options list all the common
  options appart from itself, so that's just --help at the moment.

    M ./Distribution/Simple/Command.hs -6 +9