Migrate d3js to v4 and correct d3js visualisations i.e. bug 3.20. Breadcrumb navigation for the language treemap has been improved
FastCGIExternalServer <%= @faux_path %> -idle-timeout <%= @timeout %> <%= if @flush then '-flush' end %> -host <%= @host %>
Alias <%= @fcgi_alias %> <%= @faux_path %>
Action <%= @file_type %> <%= @fcgi_alias %>