Added lock to stage positioning

        print("Starting a long-running task...")

        n_array = []

        print("Acquiring camera lock...")

        with self.microscope.camera.lock:

        print("Acquiring camera and stage locks...")

        with self.microscope.camera.lock, self.microscope.stage.lock:

            for _ in range(t_run):

                n_array.append(random.random())

                time.sleep(1)

            print("Long-running task finished! Releasing lock.")

            print("Long-running task finished! Releasing locks.")

        return n_array

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        self.lock = StrictLock(timeout=2)  #: Strict lock controlling thread access to camera hardware

        OpenFlexureStage.__init__(self, *args, **kwargs)

    def _move_rel_nobacklash(self, *args, **kwargs):

        """

        Overrides `OpenFlexureStage._move_rel_nobacklash` to acquire lock first.

        """

        with self.lock:

            OpenFlexureStage._move_rel_nobacklash(self, *args, **kwargs)

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