Upgrade Stages 7.2 to 7.3

Mandatory manual actions

<Context path="/stages" docBase="stages" cookies="true">
  <Valve className="org.apache.catalina.valves.rewrite.RewriteValve" />
  <Resources allowLinking="true" className="org.apache.catalina.webresources.StandardRoot">
    <JarResources className="org.apache.catalina.webresources.DirResourceSet" base="${stages.lib}" webAppMount="/WEB-INF/lib" />
  </Resources>
  <!– Do not save any session data when reloading/restarting.
  <Manager pathname="" />
</Context>