SimulationMovement
* added transactional variable based cache to _isTreeDelivered
* activate and flush _isTreeDelivered cache in SimulationMovement.expand and
  AppliedRule.expand (so that it's only active when calling expand, and
  flushed afterwards, to prevent issues if we call expand in the same
  transaction as a builder)
* modified SimulationMovement.expand behaviour, so that it removes applied
  rules that no longer test(), and add new ones, if no movment in the applied
  rule sub tree is linked to a delivery


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@17756 20353a03-c40f-0410-a6d1-a30d3c3de9de