Be explicit about our Interval usage.

In AuditLogger, we roll over the audit log on the Interval timer thread, which
is dubious, because it could block, but introducing an Invoker thread here
would require a ticket on a boat that sailed a long time ago. In the case of
SerialExecutor, we're just doing Thread.kill() on the Interval timer thread, so
that's fast enough.

src/main/java/com/samskivert/util/AuditLogger.java

@@ -166,7 +166,7 @@ public class AuditLogger
     }
 
     /** The interval that rolls over the log file. */
-    protected Interval _rollover = new Interval() {
+    protected Interval _rollover = new Interval(Interval.RUN_DIRECT) {
         @Override public void expired () {
             checkRollOver();
         }

src/main/java/com/samskivert/util/SerialExecutor.java

@@ -135,9 +135,8 @@ public class SerialExecutor
             final ExecutorThread thread = new ExecutorThread(task);
             thread.start();
 
-            // start up a timer that will abort this thread after the specified
-            // timeout
-            new Interval() {
+            // start up a timer that will abort this thread after the specified timeout
+            new Interval(Interval.RUN_DIRECT) {
                 @Override public void expired () {
                     // this will NOOP if the task has already completed
                     thread.abort();