patch applied (packages/Cabal): Centeralise the places that know that Cabal version number

[Duncan Coutts]

Tue Oct 10 06:59:18 PDT 2006  Duncan Coutts <duncan.coutts at worc.ox.ac.uk>
  * Centeralise the places that know that Cabal version number

    M ./Cabal.cabal +2
    M ./Distribution/PackageDescription.hs -2 +6