2015881738 - Add functions for working with products

1. In the "Products by table" process block, the "Get a retailer for all equal product categories" has been added. 2. Added amended documents, which should be victorious at once in different rows: {row:categorytree_categorymain_name} = Name of the main product category (when displaying products in groupings behind the categories behind the secondary row:categorytree_product_*); {row:categorytree_categorychild_name} = The name of the child product category (when displaying products in groupings behind categories behind an additional change row:categorytree_product_*); {row:categorytree_product_*} = Products grouped by category (de * - change key).