Add attributes to ChannelModel class.
Add attributes to ChannelModel class.


Former-commit-id: d74753de3ce17468032163b32c6141284ed8755b
openworm/PyOpenWorm,kaustubhcs/PyOpenWorm,hnunner/PyOpenWorm,gsarma/PyOpenWorm,gsarma/PyOpenWorm,travs/PyOpenWorm,openworm/PyOpenWorm