defect/de-10 -- do not send comms if pickup_ts has been set

nparcel/comms.py
* factored out the _move_files() method
* updated the process() method to suppress comms
  if the job item.pickup_ts has been set

nparcel/table/jobitem.py
* updated the job_item_agent_details_sql() method so that it
  returns the pickup_ts as well