Add channelmodel class
Add channelmodel class


Former-commit-id: 8d09521fa18c9e7b5c88614150d9118ff6d6bce4
travs/PyOpenWorm,openworm/PyOpenWorm,openworm/PyOpenWorm,gsarma/PyOpenWorm,kaustubhcs/PyOpenWorm,hnunner/PyOpenWorm,gsarma/PyOpenWorm