RFC: remove traceback from "newer branch format than your bzr"

[John Arbash Meinel]

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Emma Jane wrote:
> This evening I tried to grab a copy of Ian's new documentation. I'm using the 
> Bazaar that comes with Ubuntu (1.13) which happens to use the old formats. I 
> was a greeted with a fairly scary message. It's at the bottom of this message.
> 
> While I appreciate the usefulness of tracebacks, I'm not sure it's entirely 
> necessary or appropriate in this case. More specifically:

Just to mention that it was never intended to give a traceback when the
format was unknown. The reason we give descriptive information in the
format string is because we expected the bzr client to give a nice short:

 Unknown Format: ... requires bzr >= 1.16

So that it would be clear what was expected of the user. Obviously we
failed to codify this into a test case, and thus it regressed.

John
=:->
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