Remove obsolete code for double-click on a node SVG circle.
Remove obsolete code for double-click on a node SVG circle.

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