patch applied (cabal): cabal-install: Output usage info for the right command when pasrsing the package name arguments fails.

[bjorn at bringert.net]

Thu Jan 11 08:49:24 PST 2007  bjorn at bringert.net
  * cabal-install: Output usage info for the right command when pasrsing the package name arguments fails.

    M ./cabal-install/src/Network/Hackage/CabalInstall/Main.hs -2 +2
    M ./cabal-install/src/Network/Hackage/CabalInstall/Setup.hs -13 +17
    M ./cabal-install/src/Network/Hackage/CabalInstall/Types.hs +1