Node operations - link, merge (reservoirpy.ops)

Operations on Node and Model.

link(node1, node2[, name])	Link two Node instances to form a Model instance.
link_feedback(node, feedback[, inplace, name])	Create a feedback connection between the feedback node and node.
merge(model, *models[, inplace, name])	Merge different Model or Node instances into a single Model instance.