initial support for IPv6 (more testing needed)

socket works (without v6 filter)
  traffic selector handle IPv4/v4 cleanly
    improvements in traffic selector code
  kernel interface accepts v6 traffic selectors and hosts
  host_t class has full IPv6 support

src/charon/threads/sender.c

@@ -76,8 +76,7 @@ static void send_packets(private_sender_t * this)
 		status = charon->socket->send(charon->socket, current_packet);
 		if (status != SUCCESS)
 		{
-			this->logger->log(this->logger, ERROR, "Sending failed, socket returned %s", 
-								mapping_find(status_m, status));
+			this->logger->log(this->logger, ERROR, "Sending packet failed");
 		}
 		current_packet->destroy(current_packet);
 	}