gmxtopologyreader: fix wrong resnr offset (fixes issue 162)
gmxtopologyreader: fix wrong resnr offset (fixes issue 162)

vaidyanathanms/votca.csg,vaidyanathanms/votca.csg,vaidyanathanms/votca.csg,vaidyanathanms/votca.csg,vaidyanathanms/votca.csg