Superficial fix to compartment graph widget to not display too many nodes.
Superficial fix to compartment graph widget to not display too many nodes.

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