def column_align colindex, lrc
      raise ArgumentError, "wrong alignment value sent" if ![:right, :left, :center].include? lrc
      @calign[colindex] = lrc
      get_column(colindex).align = lrc
      @repaint_required = true
      #@recalc_required = true
    end
def column_align colindex, lrc
      raise ArgumentError, "wrong alignment value sent" if ![:right, :left, :center].include? lrc
      @calign[colindex] = lrc
      get_column(colindex).align = lrc
      @repaint_required = true
      #@recalc_required = true
    end
set alignment of given column offset
 @param [Number] column offset, starting 0
 @param [Symbol] :left, :right