[RFC] get_parent_map extra data

[Robert Collins]

So, one interesting thing is that get_parent_map returns a dict with no
entries for missing keys. It would reduce temporary dict pressure in
some cases to be able to return extra keys too. As long as clients are
iterating their own request list it will always do the right thing.

The only specific use case I have today is
RemoteRepository.get_parent_map - we're going to be buffering up 64K or
so of parent data in a single round trip; as we walk the parents graph
at this point, we could just return the full cached dict each time; this
would be slightly cheaper.

Thoughts?

-Rob
-- 
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