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/srpfleetrequest.html

@@ -30,6 +30,9 @@
                             </form>
                         {% else %}
                             <div class="alert alert-success" role="alert">{% trans "SRP Request Successfully Submitted" %}</div>
+                            <div class="text-center">
+                                <a href="{% url 'auth_srp_management_view' %}" class="btn btn-primary btn-lg">{% trans 'Continue' %}</a>
+                            </div>
                         {% endif %}
                     {% endif %}
                 </div>