Commerce Supplier Stock

This module adds some rules actions to deduct not only simple stock, but also what I'm calling Supplier Stock. Sometimes you may want to be able to sell a product even though you don't have the item in your possession. So, in this case we'd track two stock values (local stock and supplier stock). So, when local stock runs out we would switch over and sell supplier stock, which are items we don't currently have but could dropship to the customer.