Updated documentation in io__print_variable.hoc
Updated NEURON.cmd to be sole location of communication with NEURON (through its comm object).
Moved constructor for subclasses to NEURON.neural_cell
Addition of class NEURON.inspector for examining NEURON variables
Mass commit of code base, major updates to stimulus threshold code.
Broke some functionality with generic axon that I need to fix.
Started implementation of intracellular stimulation.