[merge] Make run_bzr_subprocess give better errors

[Robert Collins]

On Tue, 2006-09-12 at 16:52 -0500, John Arbash Meinel wrote:
> Right now if run_bzr_subprocess fails, you tend to get an assertion
> failure because the return code is not correct.
> Which is a correct error, but it gives no help in debugging.
> 
> The attached patch adds some debugging information to help with
> resolving the problem.
> 

+1
-rob
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