def row(row, val = nil)
      if val.nil?
        get_row(row)
      else
        set_row(row, val)
      end
    end
def row(row, val = nil)
      if val.nil?
        get_row(row)
      else
        set_row(row, val)
      end
    end
Access a row
 @overload row(row)
   Get a row
   @param row [String]
   @return [Hash]
 @overload row(row, val)
   Set a row
   @param row [String]
   @param val [Hash, Array]
   @return [Table]