def align_column colindex, lrc
      raise ArgumentError, "wrong alignment value sent" if ![:right, :left, :center].include? lrc
      @calign[colindex] ||= lrc
      if @chash[colindex].nil?
        @chash[colindex] = ColumnInfo.new("", nil, lrc)
      else
        @chash[colindex].align = lrc
      end
      @chash
    end
def align_column colindex, lrc
      raise ArgumentError, "wrong alignment value sent" if ![:right, :left, :center].include? lrc
      @calign[colindex] ||= lrc
      if @chash[colindex].nil?
        @chash[colindex] = ColumnInfo.new("", nil, lrc)
      else
        @chash[colindex].align = lrc
      end
      @chash
    end
set alignment of given column offset
 @param [Number] column offset, starting 0
 @param [Symbol] :left, :right