[MERGE] An EmailMessage class for bzrlib (v2)

[Aaron Bentley]

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Adeodato Simó wrote:
>> A common approach would be to move as much code as possible into a
>> "mixin" superclass, and then use multiple inheritance,
> 
> Hm, I was already sending a new bundle with my proposed change
> implemented when this email arrived. How attached are you to the mixin
> option?

>> I think we'd want to retain the address encoding stuff when sending
>> non-multipart messages.

> As shown above, all that is retained.

That's fine, then.  You asked for other implementation options, so I was
replying to that.  But this seems good too.

Ultimately, I'm not sure we really want to inherit from the standard
python email classes.  They seem too low-level.  But it gets us to a
better place than where we are now.

Aaron
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