Cactus: create well-known Cactus schedule bins
create a set of empty schedule bins / groups so that CCTK_ScheduleTraverse always finds and does not return an error that one of the predefined Cactus bins does not exist
create a set of empty schedule bins / groups so that CCTK_ScheduleTraverse always finds and does not return an error that one of the predefined Cactus bins does not exist