Handles action potential tables for the neurons.
For efficiency, only one copy of the action potential forms is used The action potentialis given using microsec (1e-6 sec) as X-scale (time) and microVolt (1e-6 V) as Y-scale (voltage) units. You can define a scale factor (the coded value is multiplied by that value)
At the beginning of a action potential, value (0,0) is tacitly assumed
When the membrane's threshold potential is reached, an action potential is generated. Technically, a new object "AbstractPotential" object is generated, which autonomously sends its contributions until the signal ends. More than one inedependent action potentials may be active at he same time.
1.8.17 
