Update only. Not the full package.

this contribution addresses the need for a MPN and UPC in the feed to Google Base. It uses the model_number field for the MPN and creates a new field for the UPC that can be entered while creating or editing products, will be displayed on product_info.php, and will be included in the feed to Google Base.

Basically we are just duplicating the stock code to edit and display the model_number in osCommerce, and applying it to a new UPC field.

Screenshots included.

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