*  @return whether the user is in it
         *  @since 0.24
         *  @throws IOException if a network error occurs
         */
        public boolean isA(String group) throws IOException
        {
            if (groups == null)
                groups = (String[])getUserInfo().get("groups");
            for (String g : groups)
                if (g.equals(group))
                    return true;
            return false;
        }