major update to context handling: mostly now self-contained within ne…

…twork, which maintains the single canonical value; fixed init of spkbin and improved logic: passing TestInitWeights now.

axon/act.goal

@@ -891,6 +891,9 @@ func (ac *ActParams) DecayState(ctx *Context, ni, di uint32, decay, glong, ahp f
 	Neurons[ISIAvg, ni, di] = -1
 	Neurons[ActInt, ni, di] = ac.Init.Act
 	Neurons[Spiked, ni, di] = 0
+	for i := range 8 {
+		Neurons[SpkBin0+NeuronVars(i), ni, di] = 0.0
+	}
 
 	if decay > 0 { // no-op for most, but not all..
 		Neurons[Spike, ni, di] = 0
@@ -1033,6 +1036,10 @@ func (ac *ActParams) InitActs(ctx *Context, ni, di uint32) {
 	Neurons[CtxtGeRaw, ni, di] = 0
 	Neurons[CtxtGeOrig, ni, di] = 0
 
+	for i := range 8 {
+		Neurons[SpkBin0+NeuronVars(i), ni, di] = 0.0
+	}
+
 	ac.InitLongActs(ctx, ni, di)
 }