[MERGE] An EmailMessage class for bzrlib (v1)

[Aaron Bentley]

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Aaron Bentley wrote:
> Aaron Bentley has voted +1.
> Status is now: Semi-approved

Could someone else give this a review please?  John, if you're feeling
better, I'd be interested to know what you think of this, and whether it
meets what you were hoping to accomplish by pulling this into the core.

Aaron
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