[MERGE] Revert merge and pull display using TreeTransform._iter_changes

[Aaron Bentley]

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Aaron Bentley wrote:
> This patch implements Transform._iter_changes, which translates a
> pending transform into _iter_changes format, for display purposes.

I haven't had any feedback on this for almost a week, so if I don't hear
from anyone before Friday (my time) I'll merge it.

Aaron
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