[MERGE] better support of unicode paths on Windows

[Alexander Belchenko]

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.
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