title: Magento Print Packing slip before shipping
body: <p>How can I print a packing slip before the order status is "complete" (i.e. before I submit a shipment?)
  The current workflow is a bit backwards, especially if you are using the packing slip as a pick list in the warehouse.</p>
  
  <p>Extra: A solution that is upgrade friendly.</p>
  
  <p>Thanks.</p>