Bug #0001133: One-step Checkout
- new ShippingSubTotal calculated field in order to display shipping cost + insurance fee
- notice fixed during shipping limitation calculation on empty order
- parameter "payment_type_id" is now supported in all payment gateway related tags
- tag ord_PrintTotals changed to allow displaying of an order discount
- calculated fields were missing in ItemSQLs of payment type
- added ability to load first enabled payment type, that has specific payment gateway name in settings