patch applied (cabal): Export Command constructor so cabal-install can make derived commands

Sat Dec 8 11:24:01 PST 2007 Duncan Coutts * Export Command constructor so cabal-install can make derived commands Also move commandHelp out of the structure into a helper function. Change the type of commandOptions so it doesn't include the CommonFlag. Instead, add those in whenever necessary. This makes deriving commands easier. Also fix docs. M ./Distribution/Simple/Command.hs -13 +17