Fix add_torrent() deprecation and fix tracker_reply_alert to have the

number of peers.

libtorrent/bindings/python/src/alert.cpp

@@ -86,7 +86,9 @@ void bind_alert()
 
     class_<tracker_reply_alert, bases<torrent_alert>, noncopyable>(
         "tracker_reply_alert", tracker_reply_alert_doc, no_init
-    );
+    )
+        .def_readonly("num_peers", &tracker_reply_alert::num_peers)
+        ;
 
     class_<tracker_announce_alert, bases<torrent_alert>, noncopyable>(
         "tracker_announce_alert", tracker_announce_alert_doc, no_init

libtorrent/bindings/python/src/session.cpp

@@ -174,8 +174,8 @@ void bind_session()
         .def(
             "add_torrent", &add_torrent
           , (
-                arg("torrent_info"), "save_path", arg("resume_data") = entry()
-              , arg("compact_mode") = true, arg("paused") = false
+                arg("resume_data") = entry(), arg("compact_mode") = true
+                , arg("paused") = false
             )
           , session_add_torrent_doc
         )