Return a table (list of lists) with timer data

def to_table(self, sort_key="wall_time", stop=None):
        """Return a table (list of lists) with timer data"""
        table = [list(AbinitTimerSection.FIELDS), ]
        ord_sections = self.order_sections(sort_key)

        if stop is not None:
            ord_sections = ord_sections[:stop]

        for osect in ord_sections:
            row = [str(item) for item in osect.to_tuple()]
            table.append(row)

        return table