removeMerge = function(cellName, data, keepOptions) {
    const obj = this;

    if (obj.options.mergeCells && obj.options.mergeCells[cellName]) {
        const cell = getIdFromColumnName(cellName, true);
        obj.records[cell[1]][cell[0]].element.removeAttribute('colspan');
        obj.records[cell[1]][cell[0]].element.removeAttribute('rowspan');
        obj.records[cell[1]][cell[0]].element.removeAttribute('data-merged');
        const info = obj.options.mergeCells[cellName];

        let index = 0;

        let j, i;

        for (j = 0; j < info[1]; j++) {
            for (i = 0; i < info[0]; i++) {
                if (j > 0 || i > 0) {
                    obj.records[cell[1]+j][cell[0]+i].element = info[2][index];
                    obj.records[cell[1]+j][cell[0]+i].element.style.display = '';
                    // Recover data
                    if (data && data[index]) {
                        updateCell.call(obj, cell[0]+i, cell[1]+j, data[index]);
                    }
                    index++;
                }
            }
        }

        // Update selection
        updateSelection.call(obj, obj.records[cell[1]][cell[0]].element, obj.records[cell[1]+j-1][cell[0]+i-1].element);

        if (! keepOptions) {
            delete(obj.options.mergeCells[cellName]);
        }
    }
}
Remove merge by cellname
@param cellName