2 tests in testTradeModelLine were broken since [34190] because
container_interaction_workflow relied on the fact that
causality_interaction_workflow reindexed the delivery.
PackingList.isPacked only requires that container lines/cells are indexed so
the calculatePacking activity now depends on recursive reindexation of the
container (instead of the delivery).

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34210 20353a03-c40f-0410-a6d1-a30d3c3de9de