CycleManager suggestion

[Kevin Lewis]

Jim, Do you think this is a good idea to do in the CycleManager?
	
    while (!thread->shutdownInProgress)
       {
+     // Only sleep if there is nothing to do.
+     if (!(recordVersionPurgatory || recordPurgatory ||
+           valuePurgatory || bufferPurgatory))
         thread->sleep(CYCLE_SLEEP);