Fixed a bug in the admin/sale_prices.php file. When editing an existing sale price the current expiration date wasn't loading into the fields due to an incorrect variable reference.

Added a sale prices table to the product info box of admin/categories.php so you can see all sale prices that apply to the currently selected product. Active sale prices are displayed in green and inactive ones in red.

Complete package is attached. If upgrading from the previous version simply replace the sale_prices.php file and follow instructions 11 and 12b. Note that the very first line in instruction 11 existed in the previous version so don't duplicate it or you will create an error.

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