Conflicts:
	src/Haddock/InterfaceFile.hs

This setup makes more sense since when we add value bindings to the
processed declarations (for type inference), we will have multiple
declarations which should share documentation. Also, we already have
a separate doc map for instances which we can now merge into the
main doc map. Another benefit is that we don't need the DeclInfo
type any longer.

haddock's .cabal file was declaring that it needed alex and happy to
build, but in the GHC source tarballs it doesn't.

- Docs don't get attached to the next top-level with signature by
mistake.

- If there's an export list and the top-level is part of it,
its doc comment shows up in the documentation.

(A bug that should have been fixed long ago.)

Previously this was done in the backends.

Also, warn when a doc comment refers to something that is in scope but which we
don't have the .haddock file for.

These changes mean we can make DocIdentifier [a] into DocIdentifier a.

This big patch implements a kind-polymorphic core for GHC. The current
implementation focuses on making sure that all kind-monomorphic programs still
work in the new core; it is not yet guaranteed that kind-polymorphic programs
(using the new -XPolyKinds flag) will work.

For more information, see http://haskell.org/haskellwiki/GHC/Kinds