[FIX] procurement: when cancelling procurements, cancel only the undone ones
[FIX] sale: after a shipping exception, when recreating the procurements from a SO, cancel first existing ones (if any)
[IMP] stock, usability: added a help when no package, added buttons to print the delivery order/picking list on the stock.picking, removed unused deprecated fields 'pack' and 'delivery' on stock.picking.type