Logging enhancements.

joram/a3/common/src/main/java/fr/dyade/aaa/common/AverageCPUTask.java

@@ -76,7 +76,7 @@ public final class AverageCPUTask extends TimerTask {
       cpuTime[idx%nb] = ManagementFactory.getThreadMXBean().getThreadCpuTime(id);
       // Computes the CPU time used during last minute
       average = (int) ((cpuTime[idx%nb] - cpuTime[(idx+1)%nb]) / ((60L *1000000000L) / 100L));
-      logger.log(BasicLevel.INFO,
+      logger.log(BasicLevel.DEBUG,
                  "AverageCPUTask: " + name + " CPU Time: " + cpuTime[idx%nb] + "ns -> " + average);
       idx += 1;
     } catch (Throwable t) {