iac_layer_extended_impl
=======================

A transfer function that is used to mimic the synchronization bug in the SCM
simulator for the decision layer.  The "unshunted" channel is ignored and
lateral inhibition is implemented internally --- with SCM's additional inhibition
term multiplying by own state --- based on the most recently updated state of
the preceding node.

Parameters
==========

	parameter		default_value
	decay			0
	rate			1	
	max_act			1
	min_act			0
	extra_inhibition	0