API SSO, Beautification of Tables, and more. (#562)

# One Thousandth Commit 🎉 🎈 🎆 🍾

* Allow requiring API ownership validation by SSO.
Closes #163

* Add Discourse group name length restrictions.

* Redirect after api addition/deletion of main character

* Correct admin searching for removed discourse_username field in AuthServicesInfo

* Correct admin function to sync user Discourse groups

* Beautify tables by removing borders and hiding when empty.

*Add buttons on dead-end pages to return to originating view.

stock/templates/registered/fatlinkpersonalstatisticsview.html

@@ -16,7 +16,8 @@
                 {%  endif %}
             </div>
         </h1>
-        <table class="table table-responsive table-bordered">
+        <div class="col-lg-2 col-lg-offset-5">
+        <table class="table table-responsive">
             <tr>
                 <th class="col-md-2 text-center">{% trans "Month" %}</th>
                 <th class="col-md-2 text-center">{% trans "Fats" %}</th>
@@ -32,6 +33,7 @@
             </tr>
             {% endfor %}
         </table>
+        </div>
     </div>