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Streamline _walkdirs_utf8 for utf8 file systems, reducing time to traverse a mozilla tree from 1s to .6 seconds. (Robert Collins)

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global option.
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This writes messages into ``~/.bzr.log``.
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At present this only logs actions relating to the on-disk lockdir.  It
 
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At present this only logs actions relating to the on-disk lockdir.  It 
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doesn't describe actions on in-memory lock counters, or OS locks (which
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are used for dirstate.)
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