patch applied (cabal-install): Add a install/upgrade --preference='foo < 2' flag

[Duncan Coutts]

Thu Dec 18 13:38:49 PST 2008  Duncan Coutts <duncan at haskell.org>
  * Add a install/upgrade --preference='foo < 2' flag
  This behaves just like the preferred-versions file in the hackage index
  but it can be specified on the command line or in a config file.

    M ./Distribution/Client/Dependency.hs -9
    M ./Distribution/Client/Fetch.hs -3 +7
    M ./Distribution/Client/Install.hs -21 +37
    M ./Distribution/Client/Setup.hs -4 +15

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20081218213849-adfee-d1c8dd348d16c553dc95815e9a2acd468809622c.gz