[MERGE] better support of unicode paths on Windows

[John Arbash Meinel]

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Alexander Belchenko wrote:
> Alexander Belchenko пишет:
>> Bzr has one latent bug related to create new .bzr directory inside
>> unicode directory. The problem occurs when unicode path cannot be
>> encoded in current user encoding, as pointed by INADA Naoki, see
>> https://bugs.launchpad.net/tortoisebzr/+bug/335362/comments/41
>>
>> This is rare condition, but bug itself is very serious.
>> Please, merge for 1.17.
> 
> I forgot to import trace. Fixed now.
> 

BB:tweak

See my comment for the test from your previous version.
John
=:->

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