scd:p15: Get the label value of all objects for better diagnostics.
* scd/app-p15.c (struct cdf_object_s): Add fields authid, authidlen, and label. (struct prkdf_object_s): Add field label. (struct aodf_object_s): Ditto. (release_cdflist): Free new fields. (release_prkdflist): Free new field. (release_aodf_object): Ditto. (parse_common_obj_attr): Return the label. (read_ef_prkdf): Store the label. (read_ef_pukdf): Ditto. (read_ef_cdf): Use parse_common_obj_attr and store authid and label. Print them im verbose mode. (read_ef_aodf): Store the label and print it.