- allow to edit production packing list line's quantity, quantity unit, reference and stop date from production packing list view, to make production packing list as usable as trade's packing lists

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@21890 20353a03-c40f-0410-a6d1-a30d3c3de9de