Reset iterator - no change.
  Allow re-editing of messages.

  Previously when completing a compose()/forward()/reply() operation
 the user would see a menu:

     Send mail: (y)es, (n)o, or (a)dd an attachment?

  Now there is the ability to re(e)dit the contents of the mail
 prior to sending it.  This allows you to reword things at the
 last minute; something I sorely need.

  This closes #155.
Return decoded part in CMessage::get_body_part instead of original