Fix bug when PUTting to an update handler

It was putting the doc ID at the end, after all the options
Add methods to Order to change an included item's barcode, sku or name
When an item's name, barcode or SKU changes, update all the orders it's in

Since order docs have a copy of the relevent Item data (sku, barcode and name),
if the user changes one of those fields on an item, then we have to go through
all the ordes that item is in and change them