Added preview of coupon replacement codes in Signup notification. websharks/s2member#201
Added preview of coupon replacement codes in Payment notification. websharks/s2member#201
Added preview of coupon replacement codes in Modification notification. websharks/s2member#201
Added preview of coupon replacement codes in SP Sale notification. websharks/s2member#201
Added pro-preview notice to Notifications page. websharks/s2member#201
Edited pro-preview notice to fit pages without new panels. websharks/s2member#201