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

[Aaron Bentley]

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Alexander Belchenko wrote:
> 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.

bb:approve

Aaron

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