cabal list should have --with-compiler, --user, --global and --package-db flags

[bos]

(Imported from Trac #781, reported by @dcoutts on 2010-12-21)

cabal list is lacking a way to control which compiler and package databases are queried.

See also ticket #457 about enhanced filtering for cabal list

[bos]

(Imported comment by @kosmikus on 2010-12-21)

I think that in general, we should try to aim for more consistency between flags for different commands.