DynamicGraph-class
 is the returned value from the method dg
 and from the function dynamicGraphMain. The object has the lists of vertices and blocks of the dynamicGraph, and a list of models, each (of class 
 DynamicGraphModel-class)
 with the model and the views of the model.
 
 Each view (of class DynamicGraphView-class) of a model
 will hold the edges (edges between vertices, factors and blocks)
 and factor- and extra-vertices of the view, together with 
 vectors of indices of vertices and blocks visible in the view.
 Objects of the class DynamicGraph-class is the
 outer frame holding the "data" and the models, each model is of the class 
 DynamicGraphModel-class with one or more views of the class 
 DynamicGraphView-class in a sub-frame for the model.
 The input to dynamicGraphMain should be
 of the class dg.graph-class.
dynamicGraphMain,
DynamicGraphModel-class, and
DynamicGraphView-class.