rx-cleanup-20010924

rx-cleanup-20010924

The rxi_ReceiveAckPacket() change makes sure we have two extra fields
(the max and recommended packet sizes) hanging off the packet, rather
than just one.

The PKTFLAG_FREE stuff in rx_packet.c just initialized flags in case
PKTFLAG_ACKED somehow didn't get cleared there.

The wirevec changes are off-by-1 errors: there's p->niovecs iovecs
in a packet, from 0 (header) to p->niovecs-1, so p->niovecs doesn't
refer to a meaningful iovec.