Make GLobal DAO ID public

src/de/tud/kom/p2psim/impl/util/db/dao/metric/MeasurementDAO.java

@@ -55,7 +55,7 @@ public class MeasurementDAO extends DAO {
 	/**
 	 * The Host ID that is used for global metrics.
 	 */
-	private static final long GLOBAL_HOST_ID = -1;
+	public static final long GLOBAL_HOST_ID = -1;
 
 	private static boolean inactive = false;