patch applied (cabal): Improve the QA messages a bit, use the same style as the sanity check messages

[Duncan Coutts]

Thu Jan 31 03:57:39 PST 2008  Duncan Coutts <duncan at haskell.org>
  * Improve the QA messages a bit, use the same style as the sanity check messages
  Slightly more like full sentances and using '' quotes for field names etc.

    M ./Distribution/PackageDescription.hs -1 +1
    M ./Distribution/PackageDescription/QA.hs -15 +15