message: documentation for async API, add default value for ospWait()
diff: @@ -291,7 +291,7 @@ extern "C" {
  OSPRAY_INTERFACE int ospIsReady(OSPFuture);
  /* Wait on a specific event */
  - OSPRAY_INTERFACE void ospWait(OSPFuture, OSPSyncEvent);
  + OSPRAY_INTERFACE void ospWait(OSPFuture, OSPSyncEvent OSP_DEFAULT_VAL(=OSP_TASK_FINISHED));
  /* Cancel the given task (may block calling thread) */
  OSPRAY_INTERFACE void ospCancel(OSPFuture);
  