void OESetForceFieldDummyAtom(OEChem::OEAtomBase *atom)
Modify information associated with an atom to indicate that
if the atom has atomic number
it can be used for certain force field calculations
where it would not normally be valid.
Currently, only MMFF and Amber support support dummy atoms at all, and even then only for calculations involving non-bonded terms and when this special indication has been set.
This function is defined in the OEChem TK, but in the OEFF main namespace.