do not expand the server side preferences
Do not expand whole preferences tree initially
ref #6429: adapt admin preferences to other preferences
ref #7268 Sort root nodes in preference dialog
ref #7268 Fix stateful behavior of OpenPreferenceHandler
ref #7268 Fix hierarchy of preference nodes
ref #7268 Implement own extension point for preferences
ref #6925 Add generic ExpandHandler
ref #6925 Implemente generic CollapseHandler