Cleaning old .h :

- Delete unimplemented function and unused structures
- Remove misleading configuration options
- Transfer some comments from 6lowmac to framer-802154
(doc/uip6-doc.txt should be cleaned as well)

core/net/tcpip.c

@@ -477,9 +477,9 @@ eventhandler(process_event_t ev, process_data_t data)
          * check the different timers for neighbor discovery and
          * stateless autoconfiguration
          */
-        /*if(data == &uip_nd6_timer_periodic &&
-           etimer_expired(&uip_nd6_timer_periodic)) {
-          uip_nd6_periodic();
+        /*if(data == &uip_ds6_timer_periodic &&
+           etimer_expired(&uip_ds6_timer_periodic)) {
+          uip_ds6_periodic();
           tcpip_ipv6_output();
         }*/
 #if !UIP_CONF_ROUTER