webglapp.js: restricted connectors must show only for visible skeletons.
webglapp.js: restricted connectors must show only for visible skeletons.

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