Fixed EXTENDS and IMPLEMENTS for Potential2 and PotentialSoftSpherical.  uInt returns zero.
Fixed EXTENDS and IMPLEMENTS for Potential2 and PotentialSoftSpherical.  uInt returns zero.

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