Group system overhaul (#588)

* Add open/hidden group membership display and remove

* Include requestable groups other than open

* Prevent users requesting or leaving non-joinable groups

I have not prevented users joining hidden groups however, as
there may be some use cases where the direct link is provided
for users to request access to the group.

Also prevent users generating leave requests for groups they
are not a member of.

* Refactor Group extension models into a single OneToOne model

Added group leader field

* Add blankable fields

* Switched to use navactive for menu highlighting

* Consolidate member state checking for easier code reuse

* Added support for group leaders to manage groups

* Added info log when a user removes someone from a group

* Add ordering to group member list

stock/templates/registered/groupmembership.html

@@ -0,0 +1,54 @@
+{% extends "public/base.html" %}
+{% load staticfiles %}
+{% load i18n %}
+
+{% block title %}Alliance Auth{% endblock %}
+
+{% block page_title %}{% trans "Groups Membership" %}{% endblock page_title %}
+{% block extra_css %}{% endblock extra_css %}
+
+{% block content %}
+    <div class="col-lg-12">
+        {% include 'registered/groupmanagementmenu.html' %}
+        <div>
+            {% if groups %}
+            <h3>Groups</h3>
+            <table class="table">
+                <tr>
+                    <th class="text-center">{% trans "Name" %}</th>
+                    <th class="text-center">{% trans "Description" %}</th>
+                    <th class="text-center">{% trans "Status" %}</th>
+                    <th class="text-center">{% trans "Member Count" %}</th>
+                    <th class="text-center">{% trans "Action" %}</th>
+                </tr>
+                {% for group in groups %}
+                    <tr>
+                        <td class="text-center">{{ group.name }}</td>
+                        <td class="text-center">{{ group.authgroup.description }}</td>
+                        <td class="text-center">
+                            {% if group.authgroup.hidden %}
+                                <span class="label label-info">{% trans "Hidden" %}</span>
+                            {% elif group.authgroup.open %}
+                                <span class="label label-success">{% trans "Open" %}</span>
+                            {% else %}
+                                <span class="label label-default">{% trans "Requestable" %}</span>
+                            {% endif %}
+                        </td>
+                        <td class="text-center">
+                            {{ group.num_members }}
+                        </td>
+                        <td class="text-center">
+                            <a href="{% url 'auth_group_membership_list' group.id %}" class="btn btn-primary"
+                                title="{% trans "View Members" %}">
+                                    <i class="glyphicon glyphicon-eye-open"></i>
+                            </a>
+                        </td>
+                    </tr>
+                {% endfor %}
+            </table>
+            {% else %}
+                <div class="alert alert-warning text-center">No groups to list.</div>
+            {% endif %}
+        </div>
+    </div>
+{% endblock content %}