Fixed error in class Neuron (noticed by Stephan Gerhard)
Fixed error in class Neuron (noticed by Stephan Gerhard)

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