Improve management of child containers within a shipment

[jmiranda]

Email from Kelsey Nagel

I also noticed when I was creating the shipment that you cannot delete boxes or move boxes once they are created (I reported those bugs through openboxes). In addition, when you try to move an entire pallet in the edit section, the boxes in the pallet don’t come with it. I tried to move pallet two from the end of the shipment to the middle, and the pallet itself moved, but the boxes stayed at the end where they were. I ended up renaming the items to get them in the right order.

[jmiranda]

Closing since the Shipment feature has been deprecated in favor of the Stock Movement feature.