Contains the classes that implement a software system for the definition and simulation of an hydraulic system.

The first step consists in creating the system:

		HSystem s = new HSystem();

Then (1) one can define the elements:

		Source src = new Source("Src");
		s.addElement(src);
		Tap r = new Tap("R");
		s.addElement(r);
		Sink sink = new Sink("Sink");
		s.addElement(sink);

After that (2) the elements can be connected to each other:

		src.connect(r);
		r.connect(sink);

At this stage (3) we define the parameter:

		src.setFlow(20);
		r.setOpen(true);

Eventually (4) the simulation can be started passing an observer object:

		s.simulate(new PrintObserver());