patch applied (cabal-install): Improve the cabal --help output

[Duncan Coutts]

Tue Jan 13 11:20:58 PST 2009  Duncan Coutts <duncan at haskell.org>
  * Improve the cabal --help output
  Put the general info message at the top and make the explanation of
  installing a hackage package somewhat clearer.

    M ./Distribution/Client/Setup.hs -10 +11

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20090113192058-adfee-0afb89ecd74ba3638345cf05a025645c12237e1e.gz