LP#1124498 - Patron Notice when account expires - fixes and enhancements

LP#1124498 - Patron Notice when account expires - fixes and enhancements

Changes from Michael Peters initial commit
 - Added repeat delay

 - Removed group_field since that doesn't make sense in
   this usage scenario.

 - Commented out the user param for email sender, not needed.

 - Removed error-to header, not commonly used anymore.

 - Added Auto-Submitted header since email sent out via
   this action are automatically generated.

 - Changed references to card expiring to account expiring.
   It is the patron's account that is expiring, not their card.

 - Fixed up the address lines so it tries to grab the
   mailing_address first, then the billing address.

 - Set the notices to be disabled by default.  So it takes some
   admin action to enable.

Signed-off-by: Josh Stompro <stomproj@larl.org>
Signed-off-by: Michele Morgan <mmorgan@noblenet.org>
Signed-off-by: Ben Shum <bshum@biblio.org>