protected void initVertexLocations(G g, Layout<V, E> layout) {
		Collection<V> vertices = g.getVertices();
		for (V v : vertices) {
			Point2D p = layout.apply(v);
			v.setLocation(p);
		}
	}
Gives all vertices of the graph an initial, non-null location.  This only works if the
graph has been built before this method is called.  

<P>Some graphs that have a layout will perform this same function as vertices are added.

@param g the graph
@param layout the graph layout
Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/layout/AbstractLayoutProvider.java