patch applied (cabal-install): improved error handling for multiple installs

Mon Dec 31 13:03:03 PST 2007 ijones@syntaxpolice.org * improved error handling for multiple installs When installing multiple packages, don't quit just after the first error, but rather collect the list of packages that failed to install continue installing whatever packages we can, and provide an error message at the end. M ./Hackage/Install.hs -2 +15