* Changes to use network byte order.
* Add RREQ forwading cache.
* Fix some const:ness and casts.
* RERR shall only delete old routes.
* Filter RREQ:s also using cc2420_check_remote().
* LRU management of routes.
typedef union uip_ip4addr_t {
u16_t u16[2];
u8_t u8[4];
} uip_ip4addr_t;
typedef uip_ip4addr_t uip_ipaddr_t;
This implies that one must consistently pass pointers to
uip_ipaddr_t:s and not mix and match pointers with
uip_ipaddr_t:s as was done earlier.
