patch applied (packages/Cabal): Document and refactor 'parsePackageDescription'.

[Ian Lynagh]

Mon Aug  4 12:03:24 PDT 2008  Thomas Schilling <nominolo at googlemail.com>
  * Document and refactor 'parsePackageDescription'.
  
  Hopefully this makes this function more understandable and easier to
  modify.

    M ./Distribution/PackageDescription/Parse.hs -39 +86

View patch online:
http://darcs.haskell.org/packages/Cabal/_darcs/patches/20080804190324-7c5c6-59960c58bbe25dd6d9c06fcc9986619c64aaf606.gz