There are two ways to get email from a ticket when it changes:
1) the ticket model object sends an email from its commit method
2) a discussion post is automatically added reflecting the changes,
and this post is automatically emailed
Thus except for ticket creation, every ticket change prompts two email
messages. The email sent from the ticket model object looks more like
raw python. The email sent by the discussion post is cleaned up and
nice. So `clean up' the ticket email by eliminating the former,
except for the message sent on ticket creation (which won't get a
matching discussion post).
Wolf
