Arrangement interface for those arrangements which focus on a particular
node. This interface is particularly useful for those arrangements where the
selected node has some significance to the arrangement, for instance being
in the center of the display.
public <E> N focusOnMostConnected(Graph<N,E> graph)
Select the most connected graph node to focus on. This method determines
which graph node has the most edges, and selects that one to be the
focus node. If two nodes have the same number of edges, this method
selects one arbitrarily.