Fixed a long outstanding issue with the YUI CSS grid used by our custom layout gsp.
* PIMS-2234 not-null property references a null or transient value: org.pih.warehouse.product.Product.category
* PIMS-2236 Added unique constraint to product code
* PIMS-2237 Packing List > Add product code and vendor code to improve put away process
* Added a quick view of current inventory (work-in-progress)
* Added response time debugging to category tree page (needs to be refactored)
* Fixed bugs when generating product code during product save and update
* Added hashCode and equals method to LocationGroup
* Fixed Category.isRootCategory() method