Fix: Implemented additional response status checks when processing credit cards with SecurePay.

Fix: Implemented tighter security functionality when processing credit cards with SecurePay.

New: Expressions in the Title of a menu item by having the first letter an equals followed by the expression. For example, ="My Cart (" & CartItemsQuantity & ")".

New: A function CartItemsQuantity added to the Application business object. Useful to display in menus as above.