ID's for everyone ( nodes)

src/classes/CpsNode.java

@@ -1,11 +1,13 @@
 package classes;
 
+import ui.model.idCounter;
+
 public class CpsNode extends CpsObject{
 
 	public CpsNode(String objName) {
 		super(objName);
 		this.setImage("/Images/node.png");
-		this.setID(-1);
+		this.setID(idCounter.nextId());
 	}
 
 }