[MERGE] Fetch tweaks

[Robert Collins]

This allows repositories more control over their fetch operations in the
generic fetching code. Doing so allows the groupcompress format to avoid
having to figure out full text representations, rather getting
everything as fulltext in the first place; and eliminates an unnecessary
reconcile post-fetch.

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