[MERGE] new next_with_ghosts call on graph searchers

[Robert Collins]

This is a small update to the prior patch to bring the
stop_searching_any and start_searching apis to be compatible with the
new next_with_ghosts api. Sorry :) (tests were passing before, but it
proved unusable in the fetch code).

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