Feature #157 group message reports

Implement a report for multicast messages which include:

• Average group message delivery ratio per time
• Minimum group message delivery ratio per time

configurations/Multicasts.txt

@@ -5,4 +5,7 @@ Events1.class = MulticastEventGenerator
 # Only few messages to see what's going on (one new message every 10 mins).
 Events1.interval = 600,600
 # Adapt range of message source/destination addresses to fewer hosts.
-Events1.hosts = 0,10
\ No newline at end of file
+Events1.hosts = 0,10
+
+Report.nrofReports = 1
+Report.report1 = MulticastMessageDeliveryReport
\ No newline at end of file