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/fatlinkpersonalmonthlystatisticsview.html

@@ -17,7 +17,7 @@
             {% endif %}
         </h1>
         <h2>{% blocktrans %}{{ user }} has collected {{ n_fats }} links this month.{% endblocktrans %}</h2>
-        <table class="table table-responsive table-bordered">
+        <table class="table table-responsive">
             <tr>
                 <th class="col-md-2 text-center">{% trans "Ship" %}</th>
                 <th class="col-md-2 text-center">{% trans "Times used" %}</th>
@@ -31,7 +31,8 @@
         </table>
         {%  if created_fats %}
          <h2>{% blocktrans %}{{ user }} has created {{ n_created_fats }} links this month.{% endblocktrans %}</h2>
-        <table class="table table-bordered">
+        {% if created_fats %}
+        <table class="table">
             <tr>
                 <th class="text-center">{% trans "Name" %}</th>
                 <th class="text-center">{% trans "Creator" %}</th>
@@ -58,6 +59,7 @@
 
         </table>
         {% endif %}
+        {% endif %}
     </div>