Methods to render nodes and pairs

VisuElementRenderer — a virtual class to render VisuElement.
VisuElementAtomic — a class implementing rendering for VisuRenderingAtomic method.
VisuElementSpin — a class implementing rendering for VisuDataSpin method.
VisuMethodSpin — a class defining how a set of spin should be rendered.
VisuNodeArrayRenderer — An interface grouping all the VisuElementRenderer used to represent a set of VisuNode.
VisuPairCylinderRenderer — a class to render VisuPairLink as cylinders.
VisuPairWireRenderer — a class to render VisuPairLink as wires.

Objects to draw nodes and pairs between nodes.