[MERGE] BZR_LOG env variable controls location of .bzr.log.

[Alexander Belchenko]

Robert Collins пишет:
> Robert Collins has voted resubmit.
> Status is now: Resubmit
> Comment:
> I think that the trace.enable_default_logging() call should honour the 
> new environment variable, for other programs using bzrlib.
> 
> also the new environ variable needs to be added to the list santised by 
> the test suite.

Done. I hope this variant will satisfy all reviewers.
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