Builds and returns a :class:`MdfRobot` for analyzing the results in the MDF files.

def get_mdf_robot(self):
        """Builds and returns a :class:`MdfRobot` for analyzing the results in the MDF files."""
        from abilab.robots import MdfRobot
        robot = MdfRobot()
        for task in self[2:]:
            mdf_path = task.outdir.has_abiext(robot.EXT)
            if mdf_path:
                robot.add_file(str(task), mdf_path)
        return robot