[MERGE] Create a SearchResult for memoising graph searches

[Robert Collins]

On Wed, 2008-01-16 at 12:33 +1100, Robert Collins wrote:
> This adds a SearchResult accessed via search.get_result(). This should
> be extremely useful in getting the smart server to send streams of
> revisions without having to upload megabytes of keys to it.

bb:approve

actually, it will serve as-is :)

-Rob
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