BUG: Fixed a subtle bug on slow machines that caused tests to hang.

The timer calling quit on the event loop would be called before the exec happend

pqEventDispatcher.cxx

@@ -257,6 +257,7 @@ void pqEventDispatcher::processEventsAndWait(int ms)
   pqEventDispatcher::DeferMenuTimeouts = true;
   if (ms > 0)
     {
+    ms = (ms < 100) ? 100 : ms;
     QApplication::processEvents();
     QEventLoop loop;
     QTimer::singleShot(ms, &loop, SLOT(quit()));

pqEventDispatcher.h

@@ -62,7 +62,9 @@ public:
   bool playEvents(pqEventSource& source, pqEventPlayer& player);
 
   /** Wait function provided for players that need to wait for the GUI
-      to perform a certain action */
+      to perform a certain action.
+      Note: the minimum wait time is 100ms. This is set to avoid timiing issues
+      on slow processors that hang tests.*/
   static void processEventsAndWait(int ms);
 
     /** proccessEvents method for widgets and paraview to use instead of