[MERGE] win32 selftest improvements

[Alexander Belchenko]

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Alexander Belchenko пишет:
> This patch reduce selftest false positives by 4 tests.
> Not so big, but it contains major rewrite of numbered dirs usage.
> I'd like to have it reviewed and then merged in.
> 
> Corresponding branch: http://bzrdev.bialix.com/selftest.win32

More improvements: allow `selftest --clean-output` to remove read-only files.
It's important for win32.

[µ]
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