Absolute path to permanent location in working directory
        where EricScript output for the current sample will be stored.
        (a subdirectory of `output_dir`)

def sample_out_dir(self):
        """Absolute path to permanent location in working directory
        where EricScript output for the current sample will be stored.
        (a subdirectory of `output_dir`)
        """
        if self._sample_out_dir is None:
            self._sample_out_dir = os.path.join(
                self.output_dir, self._sample_name
            )
        return self._sample_out_dir