patch applied (cabal-install): Generalise the way preferences are specified to the resolver

Thu Dec 18 12:49:17 PST 2008 Duncan Coutts * Generalise the way preferences are specified to the resolver We still provide a default global policy, but now we give a list of per-package preferences which can be on the version or installed state. Later preferences override earlier ones. M ./Distribution/Client/Dependency.hs -29 +34 M ./Distribution/Client/Fetch.hs -1 +1 M ./Distribution/Client/Install.hs -4 +4 View patch online: http://darcs.haskell.org/cabal-install/_darcs/patches/20081218204917-adfee-d...