1. Added add/edit of Product Category
2. Added JPA setup
1. Made SalesRequisitionPanel extend from AbstractMagicPanel
2. Removed custom ds/txn mgr as 2 txn mgr bug before is finally resolved
1. Fixed bug where posting sales requisition does not include recently
added items.
2. Sales requisition with no items can no longer be posted.
Updated version to 0.3.2