remove hm and contour groups on update   and colorbar group when necessary.
remove hm and contour groups on update
  and colorbar group when necessary.

iongroup/plotly.js,plotly/plotly.js,aburato/plotly.js,asolagmbh/plotly.js,etpinard/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,plotly/plotly.js,plotly/plotly.js,iongroup/plotly.js,asolagmbh/plotly.js,aburato/plotly.js,iongroup/plotly.js,etpinard/plotly.js,etpinard/plotly.js