Add one or more new columns.

        Method wraps::

                tabular.spreadsheet.addcols(self, cols, names)

def addcols(self, cols, names=None):
        """
        Add one or more new columns.

        Method wraps::

                tabular.spreadsheet.addcols(self, cols, names)

        """
        data = spreadsheet.addcols(self, cols, names)
        data = data.view(tabarray)
        data.coloring = self.coloring
        return data