Read the `AutoParal` section (YAML format) from filename.
        Assumes the file contains only one section.

def parse(self, filename):
        """
        Read the `AutoParal` section (YAML format) from filename.
        Assumes the file contains only one section.
        """
        with abiinspect.YamlTokenizer(filename) as r:
            doc = r.next_doc_with_tag("!Autoparal")
            try:
                d = yaml.safe_load(doc.text_notag)
                return ParalHints(info=d["info"], confs=d["configurations"])
            except:
                import traceback
                sexc = traceback.format_exc()
                err_msg = "Wrong YAML doc:\n%s\n\nException:\n%s" % (doc.text, sexc)
                self.add_error(err_msg)
                logger.critical(err_msg)
                raise self.Error(err_msg)