Change sort method and view for wholesale pricelist module (opencart 1.5.4.1).

Free module address for download [login to view URL] Require the following changes: 1. The standard version is sorting alphabetically by the name of the products, needs remake sorting function when viewing all the products and viewing the printed version to sorting by name of the parent category and sub-category, and only than by product name (grouping product in categories). Also, before the table of name-prices print the name of the parent category and the sub-categories. For example PPRICELIST Toys (parent category) ---Lego .. (Product) Dishes (parent category) ---Knives (sub) ------Bergoff .. (Product) ------Slasher .. (Product) ---Pots (sub) ------3 liters (Product) ------5 liters .. (Product) ------Plastic Pot.. (Product) Equipment (parent category) ---Laptops (sub) ------Acer 15 inch ... (product ------MacBook 16-inch ... (product ------... ---Phones (sub) ------Iphone ... (Product) ------Nokia ... (product ------Siemens ... (product 2. There are several customer groups, such as Guest, Optovik, Tester. Each group is given a price column of products through the use of discounts system. In the original version of the module client see only prices that are given for the client group respectively. Want the user that belongs to group Optovik, Tester can also see a column with the prices for customers with Guest, and this column may be hidden via radio.