code: def register_ipcluster(data):
      
      ## check if this pid already has a running cluster
      data._ipcluster["cluster_id"] = "ipyrad-cli-"+str(os.getpid())
      start_ipcluster(data)
      return data
docs: The name is a unique id that keeps this __init__ of ipyrad distinct
      from interfering with other ipcontrollers. Run statements are wrapped
      so that ipcluster will be killed on exit.