use the requestTimestamp as target identification

source/RobotAPI/interface/units/RobotUnit/GazeController.ice

@@ -50,7 +50,7 @@ module armarx { module control { module gaze_controller {
     interface GazeControllerInterface extends
         NJointControllerInterface
     {
-        void submitTarget(FramedPositionBase target);
+        void submitTarget(FramedPositionBase target, long requestTimestamp);
         void removeTarget();
         void removeTargetAfter(long durationMilliSeconds);
     };