Track GHC PackageId to PackageKey renaming.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Conflicts:
	src/Haddock/Interface/Create.hs
Track changes for module reexports.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Conflicts:
	src/Haddock/Interface/Create.hs