* Since Requirement Document is not associated with any workflow to manage security, it didn't make sense not to acquire local roles.
* Remove start_date and stop_date from task_report_causality_workflow.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18317 20353a03-c40f-0410-a6d1-a30d3c3de9de