made peer connection order depend on ones external IP or be random (if we don't know our external IP). Should fix #281

include/libtorrent/aux_/session_impl.hpp

@@ -382,6 +382,8 @@ namespace libtorrent
 			void free_buffer(char* buf, int size);
 			void free_disk_buffer(char* buf);
 			
+			address m_external_address;
+
 //		private:
 
 			void on_lsd_peer(tcp::endpoint peer, sha1_hash const& ih);

include/libtorrent/broadcast_socket.hpp

@@ -45,6 +45,10 @@ namespace libtorrent
 	bool is_loopback(address const& addr);
 	bool is_multicast(address const& addr);
 	bool is_any(address const& addr);
+	int cidr_distance(address const& a1, address const& a2);
+
+	int common_bits(unsigned char const* b1
+		, unsigned char const* b2, int n);
 
 	address guess_local_address(asio::io_service&);