webglapp: color skeletons with a color per node only if necessary. Before, with 'active_node_split' shading, all skeletons where being colored node-wise when only the active one needed to be.
webglapp: color skeletons with a color per node only if necessary.
Before, with 'active_node_split' shading, all skeletons where being colored
node-wise when only the active one needed to be.

htem/CATMAID,htem/CATMAID,fzadow/CATMAID,fzadow/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,htem/CATMAID