patch applied (cabal-install): Make the 'upload' command more self explanatory

[Duncan Coutts]

Mon Mar 10 16:33:46 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Make the 'upload' command more self explanatory
  It tells you what to do if you don't supply any args, rather than doing
  nothing and it check for simple mistakes and gives helpful error messages.

    M ./Main.hs -1 +20

View patch online:

  http://darcs.haskell.org/cabal-install/_darcs/patches/20080310233346-adfee-3487eb5c1ac384911e8b891d4116df652392424c.gz