Add AssignCoilGroup to be able to assign multiple coils to one group

[gmalinve]

right now we only have AssignCoil that allows the assignment of one single coil. We need to be able to assign coils to a group too.
Example:

oModule.AssignCoilGroup(["coils_1", "coils_2", "coils_3", "coils_4", "coils_5", "coils_6", "coils_7", "coils_8"], 
	[
		"NAME:coils",
		"Objects:="		, ["C1_1","C1_2","C1_3","C1_4","C2_1","C2_2","C3_1","C3_2"],
		"Conductor number:="	, "1",
		"PolarityType:="	, "Positive"
	])

Check solvers.