Continuation Core and Toolboxes (COCO) Code

added comment about plotting to huxley demo and removed extraneous demo

updated plotting routine, but not finished, commented out lines in subtract_half_space, but problems may arise if step size parameters aren't appropriate for the problem

updated demos

demo with new atlas_kd

plot routine for atlas_kd

updated update radius functionality and other minor bug fixes

apparently fully functional atlas_kd toolbox

update support files for atlas_kd

replaced an error with a warning when a continuation event is located outside of a curve segment. Can cause problems, but would be potentially common in multidimensional covering. Also fixed typo in h3_plot

removed tp, and corrected tangent vector calculation in predict