fix infinite template recursion in Django 1.6

Django 1.6 does not support including the same template in itself, even
if a conditional would prevent infinite recursion at runtime.
See https://code.djangoproject.com/ticket/3544

This solution is also more efficient, as it only causes one query
instead of at least n+1, where n is the folder depth.

filer/templates/admin/filer/folder/directory_listing.html

@@ -108,7 +108,15 @@ <h2>&nbsp;</h2>
                                 Root
                             </a>
                         </li>
-                        {% include "admin/filer/folder/folders_recursice.html" %}
+                        {% for folder in folder.logical_path %}
+                            <li>
+                                <a href="{% url 'admin:filer-directory_listing' folder.id %}{% if is_popup %}?_popup=1{% if select_folder %}&amp;select_folder=1{% endif %}{% endif %}"
+                                    title="{% trans 'Go back to the parent folder' %}">
+                                    <img src="{% static 'icons/plainfolder_48x48.png' %}" alt="{% trans 'Folder Icon' %}" width="28" height="28">
+                                    {{ folder.name }}
+                                </a>
+                            </li>
+                        {% endfor %}
                     </ul>
                 </div>