Update new management command for DB reset

Switch to content_type from mimetype
Make DB reset not nuke so much
Tidy logbook parser

templates/frontpage.html

@@ -16,7 +16,7 @@
                 {% if entry.is_deletion %}
                     {{ entry.object_repr }}
                 {% else %}
-                    <a href="admin/{{ entry.get_admin_url }}">{{ entry.object_repr }}</a>
+                    <a href="admin/{{ entry.get_admin_url }}/">{{ entry.object_repr }}</a>
                 {% endif %}
                 <br/>
                 {% if entry.content_type %}