[MERGE] Move branch stats gathering into Repository.gather_stats

[Robert Collins]

On Sat, 2007-02-03 at 21:04 +1100, Robert Collins wrote:
> This is a new Repository method 'gather_stats' for statistic data
> collection. This is expected to grow to cover a number of related uses
> mainly related to bzr info.

This tweak adds the repository wide stats to the same call, allowing
info on the hpss to be more efficient. (New full diff for ease of
total-review.)

Rob
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