patch applied (cabal-install): Implement plan improvement

Sun Jun 1 17:00:18 PDT 2008 Duncan Coutts * Implement plan improvement The idea is to improve the plan by swapping a configured package for an equivalent installed one. For a particular package the condition is that the package be in a configured state, that a the same version be already installed with the exact same dependencies and all the packages in the plan that it depends on are in the installed state. M ./Hackage/Dependency/TopDown.hs -9 +55 View patch online: http://darcs.haskell.org/cabal-install/_darcs/patches/20080602000018-adfee-b...