- When doing individual deliveries, insert a 'member' key into the copy of the
  metadata dictionary for this recipient's delivery.  This will contain the
  IMember of the recipient, if the recipient is a member of the mailing list.
  There will still be a 'recipient' key which will contain just the email
  address to deliver the message to.

- Remove $user_password from header/footer placeholders.

- Remove the 'personalize' key from the metadata dictionary and change
  decorate.process() to search only for the 'member' key.  No need for both of
  them and the 'member' key contains more information.  Plus, it allows us to
  do a more efficient member query in the delivery module some time in the
  future.

- Move some of the LMTP log messages from mailman.runner to mailman.smtp.