Major refactoring

haddock.cabal

src/Haddock/Backends/DevHelp.hs

src/Haddock/Backends/HH.hs

src/Haddock/Backends/HH2.hs

src/Haddock/Backends/HaddockDB.hs

src/Haddock/Backends/Hoogle.hs

src/Haddock/Backends/Html.hs

src/Haddock/GHC/Typecheck.hs

src/Haddock/GHC/Utils.hs

src/Haddock/Interface.hs

src/Haddock/InterfaceFile.hs

src/Haddock/Options.hs

src/Haddock/Packages.hs

src/Haddock/Syntax/Rename.hs

src/Haddock/Types.hs

src/Main.hs