sped up subgroup saving. #1476
sped up subgroup saving. #1476

USGSDenverPychron/pychron,NMGRL/pychron,USGSDenverPychron/pychron,UManPychron/pychron,NMGRL/pychron,NMGRL/pychron,NMGRL/pychron,USGSDenverPychron/pychron,UManPychron/pychron,UManPychron/pychron,USGSDenverPychron/pychron,UManPychron/pychron