Apply metadata to help formatting the output:

        - conv_funcs: convert data before column alignments
        - deco_funcs: decorate data after column alignments

def apply_meta(self, arr, funcs):
        """
        Apply metadata to help formatting the output:

        - conv_funcs: convert data before column alignments
        - deco_funcs: decorate data after column alignments
        """
        if arr is None:
            logging.error("unable to convert data: emtpy section")
            return None

        tmp = np.copy(arr)
        for col in arr.dtype.names:
            for row in self._get_row_hdrs():
                meta = self._get_meta(row, col)
                for mk, mv in sorted(meta.iteritems()):
                    if mk in funcs.iterkeys():
                        tmp[col][self.irt[row]] = \
                            funcs[mk](tmp[col][self.irt[row]], mv)
        return tmp