Make Configure.open use derived class for init
Make Configure.open use derived class for init


Former-commit-id: 0985f57a9f4d9ec29f38ff078d96dfd7742ad983
travs/PyOpenWorm,gsarma/PyOpenWorm,kaustubhcs/PyOpenWorm,openworm/PyOpenWorm,hnunner/PyOpenWorm,gsarma/PyOpenWorm,openworm/PyOpenWorm