patch applied (cabal): Make Data.Version parsing stricter

[Duncan Coutts]

Wed Jan 23 12:19:30 PST 2008  Duncan Coutts <duncan at haskell.org>
  * Make Data.Version parsing stricter
  Dissalows version strings like "1.05". It'd have to be "1.5" or "1.0.5".
  That is, leading '0's in version components are no longer allowed.
  The Version parser & pretty printer should now be exactly 1-1 and invertable.

    M ./Distribution/Version.hs -5 +10