fully implemented conference membership management and delete conference -

now almost all the conference functionality is in place

TODO

@@ -31,12 +31,9 @@ Lots!
 - Functions still to do on conferencing "topics" page:
   Add Conference To Hotlist
 
-- Functions still to do on "manage conference" page:
-  Manage members
-  Delete conference
-
 - We need a "manage" button at conference list level so we can use that to
-  manage the ordering of conferences.
+  manage the ordering of conferences.  This operation should be accessible
+  only to users with "create" privilege on the SIG.
 
 - Implement conference hotlist for users.