fixed colorbar bug: now only the colorbar for the first surface is shown/hidden
fixed colorbar bug: now only the colorbar for the first surface is shown/hidden

CVML/pycortex,smerdis/pycortex,smerdis/pycortex,smerdis/pycortex,gallantlab/pycortex,CVML/pycortex,gallantlab/pycortex,CVML/pycortex,gallantlab/pycortex,smerdis/pycortex,CVML/pycortex,smerdis/pycortex,CVML/pycortex,gallantlab/pycortex,gallantlab/pycortex