anchor.diff:      if @gantt.zoom > 2
           show_days = true
           headers_height = 3 * header_height
  +      if @gantt.zoom > 3
  +        show_day_numbers = true
  +        headers_height = (3.25 * header_height).to_i
  +      end
       end
     end
  +
   
     # Width of the entire chart
     g_width = ((@gantt.date_to - @gantt.date_from + 1) * zoom).to_i
  
positive.code:   headers_height = header_height
    show_weeks = false
    show_days  = false
  
    if @gantt.zoom > 1
      show_weeks = true
  
negative.code:     height = g_height + header_height - 1
      wday = @gantt.date_from.cwday
    %>
    <% (@gantt.date_from).upto(@gantt.date_to) do |day| %>
      <%
        width =  zoom - 1
        style  = ""
  