Long overdue commit of NEURON code while working on paper
Started significant changes to Hokanson_2013 code layout, finished fixing some bugs with the activation volume counts
Commit of paper code before doing merge with logger code
Merge commit 'bce64b0c46f87de6c6c87552781e1d33e9003c43'

Conflicts:
	matlab_code/+NEURON/+simulation/+extracellular_stim/@electrode/electrode.m
	matlab_code/+NEURON/@tissue/tissue.m