[MERGE] Repository.missing_revision_ids -> search_missing_revision_ids

[Robert Collins]

This replaces the missing_revision_ids API with
search_missing_revision_ids.

There are two key differences:
 - the new api returns a SearchResult
 - SearchResults do not offer topological ordering results at the moment

This is a stepping stone to reducing initial-branch network traffic.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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