HUnit support for the test-framework package.

This requires ghc, haskell-HUnit, haskell-ansi-terminal,
haskell-hostname, haskell-transformers, haskell-xml,
haskell-ansi-wl-pprint, haskell-mtl, haskell-regex-base,
haskell-regex-posix, and haskell-test-framework.

After uninstalling, run this command to unregister the package from
the ghc package database:   ghc-pkg recache
