[merge] progress bar tweaks

[John Arbash Meinel]

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Martin Pool wrote:
> This has three small improvements to progress bars:
> 
>  * It fixes some cases where we use inconsistent punctuation in
> progress messages which make them look bad
>  * Adds activity indicators to some more sftp ops.  It would be a bit
> cleaner to hook into the sftp network channel, but this seems to
> require breaking the paramiko abstraction a bit.
>  * When drawing the progress bar, unless specifically told otherwise,
> always draw the progress bar bit.  This fixes the current bug where
> the bar changes shape after the initial network traffic to open the
> branch, which also looks bad.
> 
> 

BB:approve

John
=:->
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