- use runghc
- drop trivial cabal_build and cabal_haddock macros
- ghc_register_pkg and ghc_unregister_pkg replace ghc_preinst_script,
ghc_postinst_script, ghc_preun_script, and ghc_postun_script
- lib templates' prof subpackage requires main library again
- make cabal2spec work on .cabal files too, and read and check name and
version directly from .cabal file
- ghc-prof does not need to own libraries/ dirs owned by main package
