def save_log(self, directory=None, logname=None, header=None):
        """
        Save analysis.lalog in specified location
        """
        if directory is None:
            directory = self.export_dir
        if not os.path.isdir(directory):
            directory = os.path.dirname(directory)

        if logname is None:
            logname = 'analysis.lalog'

        if header is None:
            header = self._log_header()

        loc = logging.write_logfile(self.log, header, 
                                    os.path.join(directory, logname))
        
        return loc
Save analysis.lalog in specified location