[MERGE] An SMTPConnection class for bzrlib

[Aaron Bentley]

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Adeodato Simó wrote:
>> I think it would make sense to just let the smtplib errors pass
>> through.
> 
> I agree with John here, and don't think it's nice for the user to get a
> traceback if some step in the SMTP dialog fails.

Responsibility for preventing a traceback should be taken at a higher
level, not here.

> A single-line error
> would be nicer, IMHO. I'll go ahead and create an SMTPError class if you
> don't object, okay?

It's okay if you make it an internal error so that an unhandled one does
generate a traceback.

Aaoron
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