dlpolytopologyreader: fixes multiple molecule reading
dlpolytopologyreader: fixes multiple molecule reading

votca/csg,MrTheodor/csg,junghans/csg,junghans/csg,votca/csg,junghans/csg,MrTheodor/csg,MrTheodor/csg,MrTheodor/csg,junghans/csg,votca/csg,junghans/csg,MrTheodor/csg,votca/csg,junghans/csg