[PATCH] Clear progress bar

[Aaron Bentley]

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Dan Loda wrote:
> The progress bar wasn't being cleared after some commands. Trivial, but
> I keep getting fooled with "conflicts encountered" only to find the "0"
> on the previous line :)

Yeah, irritating, eh?

I've also got a fix in my branch, only I wrapped it in a try/finally
block, so you also get good formatting of error messages.

Aaron
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