[MERGE] Make Tree.iter_changes public

[Aaron Bentley]

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Aaron Bentley wrote:
> John Arbash Meinel wrote:
>> This is a change that will break bzr-svn so it should certainly be
>> documented in
>> NEWS. I would also recommend providing a _iter_changes which thunks over to
>> iter_changes() if available, or possibly in the other direction.
> 
> As a practical matter, I'll do that.

Actually, there's already a NEWS entry.  What did you want me to do exactly?

Aaron
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