Migrate d3js to v4 and correct d3js visualisations i.e. bug 3.20. Breadcrumb navigation for the language treemap has been improved
<IfModule mpm_event_module>
ServerLimit <%= @serverlimit %>
StartServers <%= @startservers %>
MaxClients <%= @maxclients %>
MinSpareThreads <%= @minsparethreads %>
MaxSpareThreads <%= @maxsparethreads %>
ThreadsPerChild <%= @threadsperchild %>
MaxRequestsPerChild <%= @maxrequestsperchild %>
ThreadLimit <%= @threadlimit %>
ListenBacklog <%= @listenbacklog %>
MaxRequestWorkers <%= @maxrequestworkers %>
MaxConnectionsPerChild <%= @maxconnectionsperchild %>
</IfModule>