1. Site contacts and work order contacts now get set on create and write
of all FSM project tasks. If the task has no parent_id, it will try
to set them from the sale order if it has one. Otherwise, they are
simply inherited from the parent.
2. Changing the site or work order contact on a task no longer feeds
back to the sale order.
3. Changing the site or work order contacts on a parent task propagates
the change to its subtasks.
