brz 0.8.2 - Disable progress bar and enable it only on -v option

[Aaron Bentley]

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John Arbash Meinel wrote:
> The biggest bar that flickers is the 'reading knit index'. It can be
> slow over a remote connection, so we have it in for now. But it needs a
> parent bar, so that it doesn't flicker into life all the time.

Nah, I think it needs to die.  It should not appear unless we're
expecting it to stay active for at least a few seconds, and we can make
a pretty good guess that's not the case for a LocalTransport.

We shouldn't have progress bars everywhere, just for operations that we
expect will take some time.

Aaron
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