Need a method protected InterviewEditor BasicSessionControl.createEditor() to incapsulate IE creation

It is very difficult to use subclassed InterviewEditor into custom BasicSessionControl successor

So, on the talk to Dima F., we suggest to do the following:

1. Need a method
  protected InterviewEditor BasicSessionControl.createEditor()
and extract the code:
==============
        interviewEditor = new InterviewEditor(parent, getUIFactory(), ip);
        if (cm != null) {
            interviewEditor.setCustomRenderers(cm.getCustomRenderersMap());
            interviewEditor.setContextManager(cm);
        }
==============
2. update existing method BasicSessionControl.initEditor() to call
interviewEditor=BasicSessionControl.createEditor() instead of explicit
constructor call.