- set quantity ratio on split packing list to nice value

 - add test for case, when ratio on split packing list gives errors
 - suffixed sequence strings with SEQUENCE_STRING
 - use UPPERCASE for some constants


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26770 20353a03-c40f-0410-a6d1-a30d3c3de9de