add checkboxes to show or hide forward and reverse waves; only works when its not running (i.e., lines are not animated); not sure why; if change line_color it hangs, if change line_alpha to none, it does not hang but the color comes right back
add checkboxes to show or hide forward and reverse waves; only works when its not running (i.e., lines are not animated); not sure why; if change line_color it hangs, if change line_alpha to none, it does not hang but the color comes right back

gregnordin/ECEn360_Winter2016,gregnordin/ECEn360_Winter2016