Add a script for selecting deliveries in purchase_packing_list_builder like in sale_packing_list_builder.

With this change, test_11_PackingListDecreaseTwoTimesQuantityAndUpdateDelivery of testPackingList works fine for Purchase Packing List too.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@23577 20353a03-c40f-0410-a6d1-a30d3c3de9de