code: public <T extends OccupantInfo> boolean updateOccupantInfo (
          BodyObject body, OccupantInfo.Updater<T> updater)
      {
          PlaceManager pmgr = _plreg.getPlaceManager(body.getPlaceOid());
          return (pmgr == null) ? false : pmgr.updateOccupantInfo(body.getOid(), updater);
      }
docs: Locates the specified body's occupant info in the specified location, applies the supplied
  occupant info operation to it and then broadcasts the updated info (assuming the occop
  returned true indicating that an update was made).