patch applied (cabal-install): Minor improvements to InstallPlan documentation and error reporting

[Duncan Coutts]

Tue May  6 16:59:05 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Minor improvements to InstallPlan documentation and error reporting

    M ./Hackage/InstallPlan.hs -5 +16

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20080506235905-adfee-004415ee1f8051bf5d7508ac72f82071036a1066.gz