moved an anonymous inner-class of another anonymous inner-class to a
separate Java class for readability and easier maintenance
adding an entity to a model now causes the width of the ontology to
increase if necessary or the height of the model to increase if
necessary (which triggers an increase of height of the ontology).
Increasing both width and height at the same time does not work yet.
Merge branch 'master' of github.com:deep-modeling/melanee-core