[MERGE] selftest fails if the committer name contains non-ASCII characters

[Lukáš Lalinský]

I think the patch is clear enough. If the committer has a non-ASCII
character in the name, selftest fails because log.py contains:

        print >>to_file, indent+'committer:', revision.rev.committer

where revision.rev.committer is an Unicode string, and StringIO() does
only ASCII conversions.

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