clean up resolver casts to handle both old and new libraries

avoid linking problems against BIND 4.9.3

compatibility with BIND 4.9.3 (just cleanup)

Cray fixes from Eric Wassenaar

change NAMED_BIND to a 0/1 flag to allow Makefile override

fix CNAME loop problem: gave error messages and requeued messages

apply workaround to broken res_search on Ultrix

add additional error message for configuration error

diagnose problems caused by resolver bugs (sigh)

some extra debugging info

strip trailing dot off of names that have one in getcanonname
to avoid ending up with double dots

use better MX hash function

Unicos portability changes

if HOSTALIASES is set, be sure to use it during canonification

if option I is not set, be more forgiving on host unknown errors
to allow fallback to hosts table

changes to delete FallBackMX if it is already in the MX list; save
for major release

canonify [host] addresses in getmxrr

improve connection caching by making [host] look like host after
hostsignature call

really ignore MX records if !trymx

really ignore MX if !trymx in getcanonname; minimize unnecessary
nameserver calls

old 4.3BSD changes

FallBackMX wasn't properly supressed if it pointed to yourself

add 'w' option handling; be sure to fully qualify all MX addresses

4.4BSD snapshot (revision 8.1)

check for CNAME loops