patch applied (cabal-install): Fix improvePlan so the index is updated incrementally

[Duncan Coutts]

Mon Jun  2 09:39:44 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Fix improvePlan so the index is updated incrementally
  It's important since later packages can depend on earlier ones having
  been changed from configured to pre-existing. That is afterall the
  whole point of considering them in reverse toplogical order.
  Also, remove duplicates in the dependencies list of installed
  packages since ghc-pkg does not currently prevent duplicates in (eg
  multiple depends on the same version of base). See ghc bug #2230.

    M ./Hackage/Dependency/TopDown.hs -8 +9

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20080602163944-adfee-a0c199d9a1865a47f3bbb655578cb4a62f1d6795.gz