Note:
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Templates have changed, and we are now using smarty scopes. There may be compatibility problems with your templates and logic.

- Adds functionality for restricting purchases based on qoh data:
- Depends on a preference (off by default)
- Checks the product (or product option) for qoh after submit and will not accept the cart item if quantity > qoh
- Checks the items already in the cart after submit and will not accept the cart item if total quantity > qoh
- Hide options from the dropdown if qoh < 1
- Adds ability to override price per sku (not options)
- Adds support for extended promotions.