- Initial implementation of "Append .!qB extension to incomplete files" (untested)

- Update torrent save path when its label is changed and "Append label to save path" setting is set

src/qtorrenthandle.h

@@ -158,6 +158,7 @@ class QTorrentHandle {
     void set_peer_download_limit(libtorrent::asio::ip::tcp::endpoint ip, int limit) const;
     void add_tracker(announce_entry const& url);
     void prioritize_first_last_piece(bool b);
+    void rename_file(int index, QString name);
 
     //
     // Operators