demandimport: stop overriding __getattribute__() Proxy __dict__ and __doc__ explicitly instead. I'm not sure which is less evil, but this seems slightly simpler than hooking all attribute accesses.

demandimport: look for 'mod' suffix as alternative name for module reference It's widely used in our codebase.

demandimport: insert empty line per method _demandmod class is getting bigger, and I don't want to put more things in a dense form.