DUAL Pricing v2

[adam2020]

I fixed the problem after another look I found a field wasn't added to the products_discount_quantity table due to an error with the install sql. Once this was loaded I was able to change the quantity discounts to work :)

Change:
ALTER TABLE `products_discount_quantity` ADD `discount_price_w` VARCHAR( 150 ) DEFAULT '0' AFTER `discount_price_w`;
To:
ALTER TABLE `products_discount_quantity` ADD `discount_price_w` VARCHAR( 150 ) DEFAULT '0' AFTER `discount_price`;