[MERGE] Make Tree.iter_changes public

[Aaron Bentley]

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John Arbash Meinel wrote:
> Aaron Bentley wrote:
> | Actually, there's already a NEWS entry.  What did you want me to do
> exactly?

> Probably just expanding on your NEWS entry something like:
...
Done and submitted.

> I'm not sure if we need something in API breaks.

I'm pretty sure we don't.

Aaron
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