fix dublicate pages

Full info http://for-opencart.com/must-be/dubles-page

Module removes duplicates product pages. Correctly (without hierarchy) generated links: 
- Module bestsellers
- Module latest
- Module special
- Module featured
- List of products by manufacturer page
- Recommended on the product page
- List of special products (product/special)
- Search page
- Product compare page

Module generates the correct links.
Sample no module 
http://site.com/1551/index.php?route=product/product&product_id=42
Sample with module
http://site.com/1551/index.php?route=product/product&path=25_28&product_id=42

Demo: http://xml.for-opencart.com/1551 see modules on main page.

Works with vqmod
Does not replace the files on your site