Ticket #1067915

XML file created for the new keywords and changed customer discount so that user are able to choose from a drop down menu. In addition the discount value will be displayed in the offer information. When adding new offeritems the discount will be put on the price to calculate the new discount price. Preview was activated and discount calculation adapted. Created xml file to extend salesorderitem table with TRADE_CUSTOMER_DISCOUNT. Depending on the current selected customer discount the price discount will be calculated correctly. This calculation is valid if the user changes the quantity of the product.