[XML-SIG] printing Unicode xml to StringIO

[Martin v. Loewis]

> PS: Martin, also thanks for taking this to python-dev.  I'm not sure
> whether it still makes sense to file a bug report at SF?

If you still think there is a bug, please do. If MAL's point-of-view
has convinced you, there's no need - we'd just wait for the next time
somebody runs into the problem, to get a better understanding of
whether the change is acceptable to users or not.

Regards,
Martin