Migrate d3js to v4 and correct d3js visualisations i.e. bug 3.20. Breadcrumb navigation for the language treemap has been improved
<IfModule mpm_itk_module>
StartServers <%= @startservers %>
MinSpareServers <%= @minspareservers %>
MaxSpareServers <%= @maxspareservers %>
ServerLimit <%= @serverlimit %>
MaxClients <%= @maxclients %>
MaxRequestsPerChild <%= @maxrequestsperchild %>
</IfModule>