Add display_behavior_components for PhysicalComponent context diagrams

[ewuerger]

Extend context_diagram for PhysicalComponents of nature NODE with a parameter (flag) called display_behavior_components. Adding behavioral components by default isn't correct. Also when adding PhysicalComponents of nature BEHAVIOR exchanges of types ComponentExchange and PhysicalLink may be mixed, which can cause label collison of NODE boxes. This is very hard to solve because we would need to calculate the size of the NODE box based on the size of its children and predict the positioning of the PhysicalLink ports to predict the NODE's children positions.