new permissions:

* list members may be nominated as moderators by admin
* admin may allow moderators to nominate more moderators
* admin may set allowed senders to one of the following:
    * owners and mods
    * all subscribers
    * everyone
* moderators are now able to remove members from list

static/templates/listmembers.st

@@ -5,6 +5,7 @@
             <th>Name</th>
             <th>Email</th>
             <th>State</th>
+            <th>Actions</th>
         </tr>
     </table>
     <script type="text/javascript">