[MERGE] harmonize run_bzr_subprocess with run_bzr

[Daniel Watkins]

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Martin Pool wrote:
> The bzr() method there should probably just be removed, but that can be
> done later.
This is done in the 'c' part of my test-update merges.

- --
Daniel Watkins (Odd_Bloke)
University of Warwick Christian Focus President
University of Warwick Computing Society WUGLUG Liaison Officer
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