* Issue #19. Adding new Replacement Codes: `%%full_coupon_code%%`, `%%coupon_code%%` and `%%coupon_affiliate_id%%`. These are now available in all API Tracking Codes, in all Custom Return URLs for Pro Forms, and in most API Notifications.

* Deprecating the `%%affiliate_id%%` Replacement Code for tracking Affiliate Coupon Codes in favor of `%%coupon_affiliate_id%%`.