MultiUserChat.SetPrivilege called Get, but never Set - Bug

[cimframe]

The SetPrivilege methods never called set, hence never set any affiliation or role values. Instead, these overridden methods called a superfluous method PostSetPrivilege which did a get, but the purpose of the methods is in question. I propose rewriting the methods to do a set (hence, their name) and an example of one of the methods would look as follows:

        /// <summary>
        /// Allows owners and admins to change affiliations for an occupant.
        /// </summary>
        public bool SetPrivilege (Jid room, string nickname, Affiliation affiliation, string reason = null) {

            room.ThrowIfNull ("room");
            nickname.ThrowIfNull ("nickname");

            var item = Xml.Element ("item")
                .Attr ("affiliation", affiliation.ToString ().ToLower ())
                .Attr ("nick", nickname);

            if (!string.IsNullOrWhiteSpace (reason)) {
                item.Child (Xml.Element ("reason").Text (reason));
            }

            var queryElement = Xml.Element ("query", MucNs.NsAdmin)
                .Child (item);

            var iq = im.IqRequest (IqType.Set, room, im.Jid, queryElement);

            return iq.Type == IqType.Result;
        }