hidden behind #ifdef's, since no OPT code number has yet to be assigned
by the IANA. They are also not quite complete in all regards; VIEW
options are understood and ignored. ZONE options are understood and
acted upon, though some of the error cases aren't quite right.
Remove doubled isc_mem_stats in dighost.c
Update todo list.
Change literal 255's to DNS_NAME_MAXWIRE in name.c
Examine dig8's behavior when one of the servers it talks to servfail's
back, and, if necessary, reproduce behavior in dig9. (RT351)
Remove or fix port number display in places where it is not correctly
reported (nslookup, in particular). (RT352)