code: def initialize_watcher(samples):
      
      work_dir = dd.get_in_samples(samples, dd.get_work_dir)
      ww = WorldWatcher(work_dir,
                        is_on=any([dd.get_cwl_reporting(d[0]) for d in samples]))
      ww.initialize(samples)
      return ww
docs: check to see if cwl_reporting is set for any samples,
      and if so, initialize a WorldWatcher object from a set of samples,