title: howto add custom form into django administrator page inlines
body: <p>Can I get a form into Django Administrator page, that I have defined in forms.py?
  Can I also get this form into Model inlines of Django Administrator page ?</p>
  
  <p>To be clear, this is what I call inline:</p>
  
  <pre><code>class AnswerInline(admin.StackedInline):
    ...
  </code></pre>