phases: test phases tracking at the transaction level
Now that we have all tracking in place, the data in `tr.changes['phases']`
dictionary should be correct and we should test it.
It is a bit late in the cycle to discuss to add any public API (eg: hooks)
that expose the data to the user, so we just add a small test extension
displaying the data. It is enabled for the phases tests.
New output have been manually checked for consistency.
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