Method mergeColumns

src/csvtable.cpp:859–870

* mergeColumns * Merges column `column` with `column+1`, using `mergeStr`. */

 *	Merges column `column` with `column+1`, using `mergeStr`.
 */
void CsvTable::mergeColumns(const table_index_t column, std::string mergeStr) {
	if( column < 0 || column >= getNumberCols() - 1 ) {
		return;
	}
	size_t R = getNumberRows();
	for( size_t row = 0; row < R; ++row ) {
		std::string newCell = getCell(row,column) + mergeStr + getCell(row,column+1);
		setCell(newCell, row, column);
	}
	delCols(column+1, column+1);		// delete old column to the right
	updateInternals();
}