def name_to_cell(name)
      col_index, row_index = *Axlsx::name_to_indices(name)
      r = rows[row_index]
      r[col_index] if r
    end
returns the column and row index for a named based cell
@param [String] name The cell or cell range to return. "A1" will return the first cell of the first row.
@return [Cell]