Weave.join(), and progress indicator fixes

[John A Meinel]

I fixed the Weave.join() to use the optimized path, along with a test to
make sure texts are unnecessarily extracted.
I also fixed the Weave.join() so it doesn't need to reweave if it comes
across another weave with parents re-ordered, or with repeat parents.

While I was there, I fixed up the progress indication so that it doesn't
report all of those 0/1 messages. And I added a progress indicator so
that the expensive inventory join shows more than just 0/1 for a long time.
(Also, by doing the pb.update after the optimized path, we don't get
many progress dots on non tty).

The branch is available here:
http://bzr.arbash-meinel.com/branches/bzr/fix-weave-join

There are only 2 patches, the first one fixes the optimized code path
and adds the tests. The second updates the progress bars.

Can I get a review?

John
=:->
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