childList should never be null.  this was needed before because setIndex could somehow get called from the super-constrcutor
childList should never be null.  this was needed before because setIndex could somehow get called from the super-constrcutor

ajschult/etomica,etomica/etomica,etomica/etomica,ajschult/etomica,ajschult/etomica,etomica/etomica