[MERGE] Make Tree.iter_changes public

[Aaron Bentley]

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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.

But I really shouldn't have to.  A plugin author who is tempted to use a
private method should ask for the method to be made public, not just go
ahead and use it.

Aaron
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