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

[Aaron Bentley]

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Hi all,

This patch implements Transform._iter_changes, which translates a
pending transform into _iter_changes format, for display purposes.

It then changes "revert" to use TreeTransform._iter_changes, so that it
reflects conflict resolution better.  It adds the same output to "merge"
and "pull".

Since the output is provided using trace.note(), --quiet will silence it.

Aaron
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