darcs patch: FIX #1463 (implement 'ghc-pkg find-module')

[Claus Reinke]

  - the ticket asks for a module2package lookup in ghc-pkg
    (this would be useful to have in cabal, as well)

  - we can now ask which packages expose a module we need,
    eg, when preparing a cabal file or when getting errors
    after package reorganisations:

    $ ./ghc-pkg-inplace find-module Var
    c:/fptools/ghc/driver/package.conf.inplace:
        (ghc-6.9.20071106)

    $ ./ghc-pkg-inplace find-module Data.Sequence
    c:/fptools/ghc/driver/package.conf.inplace:
        containers-0.1

  - implemented as a minor variation on listPackages

  (as usual, it would be useful if one could combine
  multiple queries into one)

claus

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