[Spambayes] working around missing Content-Transfer-Encoding wrt base64

[Skip Montanaro]

I'm going out of town (completely away from computers) for a week early
Saturday.  Would somebody else please test the attached patch against their
email collection and see if it makes sense to check in?  Summary of my tests
are at

    http://mail.python.org/pipermail/spambayes/2003-February/003312.html

Thanks,

Skip

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