[merge] update --revision

[John Arbash Meinel]

This is Mattheiu Moy's patch to add the '--revision' argument to update.

The only changes are some line-breaking (to keep it under 80
characters), and I added a NEWS entry.

I'm +1 on the change, and would like to see it merged for bzr-0.11.

You can get the branch from here:
http://bzr.arbash-meinel.com/branches/bzr/0.11-working/update-r

I also associated the branch with the bug here:
https://launchpad.net/products/bzr/+bug/45719

So you can get the branch out of that as well. (At least once Launchpad
mirrors my branch).

John
=:->
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