[MERGE, 154173] * ``pack-0.92`` repositories can now be reconciled.

[Robert Collins]

This hooks in the new logic I wrote to make reconcile smaller into the
pack to pack fetch operation, in a subclass for reconciling.

It passes all the reconcile interface tests. Its possible there are
still some corners to improve. Specifically if you reconcile a fully
packed repository where only the indices are wrong, it is *possible* for
the same pack to be generated, and then the new indices will not be
applied. But this is extremely hard to trigger (requires that the only
bad index entry is also the last text in the pack, and sort order issues
come into it too.). I'll follow up tomorrow probably with code to handle
that particular case.

John, I've done the first part of the work for bug 165290, for text
parents, as part of this patch - I needed it for reconcile.

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