Migrate d3js to v4 and correct d3js visualisations i.e. bug 3.20. Breadcrumb navigation for the language treemap has been improved
<%- @types.sort.each do |type| -%>
AddOutputFilterByType DEFLATE <%= type %>
<%- end -%>
<%- @notes.sort.each do |type,note| -%>
DeflateFilterNote <%= type %> <%=note %>
<%- end -%>