- moved worker/process code related to persistant /tmp/worker_## directory

  into the Worker object (and out of the Process)
- added Process::worker method so that running processes can talk to the
  worker that is currently running itself.
- modified system so that if a process subclass uses Process::dataflow_output_id
  on branch_code 1, it will turn off the automatic of flowing of the input_job
  out on branch_code 1.  This will make coding much cleaner so that processes
  no longer need to modifiy the input_id of the input_job
- added method Process::autoflow_inputjob which toggles this autoflow behaviour
  if a subclass would like to modify this directly
- auto_dataflow now happens right after the Process::write_output stage