'Add new rows at the end of the table.
:param rowvalues: A list of row values used to initialze the
table.  Each row value should be a tuple of cell values,
one for each column in the row.'

def extend(self, rowvalues):

    for rowvalue in rowvalues:
        self.append(rowvalue)
    if self._DEBUG:
        self._check_table_vs_mlb()
