#169 Admin on teams

* adds admin column on team index view
* refactors Team model, so multiple members can become admins
* adds team migration for switch from fkey->m2m structure
* renames 'Group' to 'Permission' on user index view to avoid confusion between 'Groups' and Teams
* adds new autocomplete route for team-admin selection based on already selected members of the TeamForm

templates/modal/modal_form.html

@@ -16,7 +16,7 @@
 
     <div class="modal-body">
         <article>
-            {{ form.form_caption }}
+            {{ form.form_caption|linebreaks }}
         </article>
         {% include 'form/table/generic_table_form_body.html' %}
     </div>