[MERGE] make run_bzr stricter about which keyword arguments it takes

[Michael Hudson]

I had a very minor boggle when writing my last patch because run_bzr
happily accepts and ignores any keyword arguments it doesn't know about
(then I found out about run_bzr_error).  This bundle adds a check that
no unknown arguments were passed, and also fixed the docstring of
run_bzr_error to not use deprecated arguments style while I was there.

Cheers,
mwh
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