[MERGE REVIEW] progress bars for tree builds

[Aaron Bentley]

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Robert Collins wrote:

| The use of PP suggests there are two phases. But I can only see one
| phase occuring - the next phase calls occur before and after the only
| loop, and no pb calls occur after that.

The first phase is the transform preparation, the loop you see.  The
second phase is the transform application.  TreeTransform.apply does
bzrlib.ui.ui_factory.nested_progress_bar(), so no progressbars are passed.

Aaron
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