Restored per-node user coloring in 3D viewer.
Restored per-node user coloring in 3D viewer.

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