used only by parser: adds a row of columns

def friend_addRow(self, rowNum, row):
                """used only by parser: adds a row of columns"""
                self[rowNum] = row
                if (rowNum > self.maxRow):
                        self.maxRow = rowNum

                for cellNum in row.keys():
                        if cellNum > self.maxColumn:
                                self.maxColumn = cellNum

                return row.friend_Finalize()