saves statistics from the last second from peer connections that are disconnected. Partly fixes #339

include/libtorrent/torrent.hpp

@@ -180,6 +180,7 @@ namespace libtorrent
 		std::string name() const;
 
 		stat statistics() const { return m_stat; }
+		void add_stats(stat const& s) { m_stat += s; }
 		size_type bytes_left() const;
 		boost::tuples::tuple<size_type, size_type> bytes_done() const;
 		size_type quantized_bytes_done() const;

src/peer_connection.cpp

@@ -2218,6 +2218,10 @@ namespace libtorrent
 
 		if (t)
 		{
+			// make sure we keep all the stats!
+			calc_ip_overhead();
+			t->add_stats(statistics());
+
 			if (t->has_picker())
 			{
 				piece_picker& picker = t->picker();