Add comments display to versioning history (because why not).

Maybe in future we could have a box people can type in before they save changes to an event... But that's a separate project

RIGS/templates/RIGS/activity_table.html

@@ -59,6 +59,7 @@
                     <td>Version ID</td>
                     <td>User</td>
                     <td>Changes</td>
+                    <td>Comment</td>
                 </tr>
                 </thead>
                 <tbody>
@@ -75,6 +76,7 @@
                                   {% else %}
                                     {% include 'RIGS/version_changes.html' %}
                                   {% endif %}                        </td>
+                                  <td>{{ version.revision.comment }}</td>
                             </tr>
                         
         			{% endfor %}