give more flexibility in specifying strucure of molecule made by AtomFactoryHetero previously, molecule was made from just one atom from each child factory change permits arbitrary number of atoms from each child factory
give more flexibility in specifying strucure of molecule made by AtomFactoryHetero
previously, molecule was made from just one atom from each child factory
change permits arbitrary number of atoms from each child factory

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