[Buildbot-devel] More for the TODO

[Brian Warner]

> It would be very useful to be able to follow-up against the original commit 
> email messages with the result emails.

Ooh! I like it. Let's see, I guess we could add a getMessageID() method to
the Change, which returns None unless it was created by one of the mail
parsers. Then the MailNotifier can walk through build.getChanges() and
accumulate a list of Message-IDs. Can a message have multiple In-Reply-To
headers, or should it pick just the first suitable Change and put the rest in
the References: headers?

 -Brian