in the rm_data method, now able to delete plots as well; in the md_file object, removed optional input argument dir (using object property metadata_dir)
in the rm_data method, now able to delete plots as well; in the md_file object, removed optional input argument dir (using object property metadata_dir)

jgte/orb,jgte/orb,jgte/orb,jgte/orb,jgte/orb