for osCommerce Online Merchant v2.2

About ----- This contribution allow to create Customers Groups, and to bind a discount rate to them. The administrator can set groups, group's discount, and bind customers to groups. The prices in catalogue are already shown with the applied discount, unlike other contributions like this that use the "order_total" method, to show a final discount. Discount rate is applied on every price, also on product attributes, but it is not applied on special prices. Please visit osCommerceITalia @