[MERGE][#230567] Faster (local) branch

[Ian Clatworthy]

Ian Clatworthy wrote:

> This patch improves Bazaar's local branch in shared-repo time
> from 22 secs to 15.8 secs on a Mozilla tree with 12456 revisions.
> It also improves the local branch time on an OpenOffice.org
> tree with 305k revisions from 73.4 secs to 41.5 secs.

This version fixes a bug in the previous version and goes back
to using the preferred way of updating the inventory. It's a
fraction of a second (0.2 or so) slower but that's the right
tradeoff vs using an 'evil' API.

Ian C.
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