[merge] MVC progress bars, and indication of network traffic

[John Arbash Meinel]

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Martin Pool wrote:

...

> 
> I'm glad you caught this, but I think we do need to be more clear about
> whether the caller is or is not supposed to call close on the file
> returned from get().  It seems to me that doing so should mean "I'm done
> with this logical file", and this should not rely on them knowing how
> the underlying transport implements it.

I think we should allow callers to call .close() on anything returned
from Transport.get().

John
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