Product Sales Report in Product Form [OC v1.5.x]

Very useful extension if you want detailed sales report of the particular product in product form (Catalog -> Products -> Edit product -> Product Sales Report tab). Report is divided by product options, by clicking on product name you can view detailed list of customers who bought this product (with product options), purchased quantity, total amount, you can view order date, order number, invoice number and order status. There is possibility filtering by purchased date or statistics range. Added Sold column in product list for quick overview of sold quantity of every product.

Notice to existing users:
Please do not post any code related to the extension or questions related to issues with installation that you may have in the comments area or forum. Read the detailed installation instructions and if you still can't find a resolution please send me an email with full details of issue.