patch applied (cabal-install): executeInstallPlan now takes an installer instead of calling installPkg

[Duncan Coutts]

Wed May  7 11:21:58 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * executeInstallPlan now takes an installer instead of calling installPkg
  Four of the executeInstallPlan param were just passed through directly
  to installPkg so this decouples them a bit.

    M ./Hackage/Install.hs -24 +19

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20080507182158-adfee-de240e450b0f4e39db46cfb97bc4770fbfd78bd5.gz