don't sort packets alphabetically by default, improve readability

examples/src/DisExamples/PduSender.java

@@ -148,8 +148,8 @@ public class PduSender
                 }
             }
 
-            // Sort the created PDUs by class name
-            Collections.sort(generatedPdusList, new ClassNameComparator());
+            // Sort the created PDUs by class name, if desired
+//            Collections.sort(generatedPdusList, new ClassNameComparator());
 
             // Send the PDUs we created
             InetAddress localMulticastAddress = InetAddress.getByName(DEFAULT_MULTICAST_ADDRESS);