[MERGE] PreviewTree.iter_changes supports all parameters

[Aaron Bentley]

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John Arbash Meinel wrote:
> Aaron Bentley wrote:

>> When we were only using PreviewTree.iter_changes for doing diffs, it was
>> okay for it to not support the set of parameters.  But now, with Shelf
>> 2, we want more from it, and we can use the default iter_changes
>> implementation to get that.

> Seems like a cheap implementation (you just thunk back to the generic),
> but as long as we are on the "make it work, make it right" phase (and
> may not need the "make it fast" for a while).

Yep.  Performance is reasonable when unshelving bzr.dev itself, at least.

Aaron
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