Make sure that the points and strokes are in order.

        Returns
        -------
        list
            A list of all strokes in the recording. Each stroke is represented
            as a list of dicts {'time': 123, 'x': 45, 'y': 67}

def get_sorted_pointlist(self):
        """
        Make sure that the points and strokes are in order.

        Returns
        -------
        list
            A list of all strokes in the recording. Each stroke is represented
            as a list of dicts {'time': 123, 'x': 45, 'y': 67}
        """
        pointlist = self.get_pointlist()
        for i in range(len(pointlist)):
            pointlist[i] = sorted(pointlist[i], key=lambda p: p['time'])
        pointlist = sorted(pointlist, key=lambda stroke: stroke[0]['time'])
        return pointlist