[MERGE REVIEW] Progress bar shows overall progess, esp for merge and revert

[Aaron Bentley]

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Hi all,
I've built on Robert's nested progress bar stuff to implement an overall
progress bar.  This indicates the overall progress, with child progress
objects adding a 'child fraction' to the overall progress bar.

So if you have a stack depth of 3 and

bottom = 1/2
middle = 3/5
top = 1/4

the overall indicator will be at (1+((3+(1/4))/5))/2 * 100 = 82.5%

In addition, this patch hides the ETA by default (because there are far
fewer top-level changes, so it's rarely displayed) and shows a spinner
(which is updated every time a child is updated, subject to throttling).

This patch also introduces the ProgressPhase object, a helper for
managing progress in a multi-phase operation like, say "merge" or "revert".

It also updates "merge" and "revert" to use the API properly.  What a
coincidence!

Patch attached, or see bzr.ab

Aaron
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