Revised interfaces in relation with variation handling. variated and variation range are now split, in order to exhibit the difference between leaf movements (ex. Delivery Cell) and movement containers (ex. Delivery Line whenever it contains Delivery Cells). APIs need more revision, with some parameters currently missing and a few not relevant.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33138 20353a03-c40f-0410-a6d1-a30d3c3de9de