* Add new flag -fddump-minimal-imports, which dumps a file
  M.imports that contains the (allegedly) minimal bunch of
  imports that make the system work.
  It's done by Rename.printMinimalImports

* Extend foreign import/export to handle
	* Booleans
	* newtypes
  as requested by the FFI team

* Tidy up DsCCall quite a bit
  Remove maybeBoxedPrimTy from TcHsSyn