Fixed #2864 Moved js-on body class behavior from an API tag to the ShoppCheckoutPage controller
Fixed #2884 Corrected smart collection load option handling
Fixed Also Bought for product pages and added WP cache support
#2871 Fixed tax total when location changes change tax rates
#2871 Corrected product 'not taxed' option handling for EU-RoW tax baleeted pricing code
Fixed #2892 Implemented ShoppDBInterface

Refactored all of the mysql_* calls to load the appropriate ShoppDBInterface engine class (for mysqli extension or the original mysql extension).

This should correct both #2892 and #2843