flock instead of locking files, major security fixes, minor other stuff

add I option to insist on Internet domain server; add NAMED_BIND
compile option to compile in named routines.

install approved copyright notice

add Berkeley specific header

pass sending hostname correctly back via the $s macro (broken sometime
earlier); hack around some name server changes

hack around compiler bug that gets confused on isascii

Fix security bug allowing writing to arbitrary files; from Bart Miller
at U. Wisconsin.

don't let "locked job" messages remove transcript & lock

make sure that 0, 1, and 2 are open to avoid confusing syslog;
from Steve Schoch <schoch@orion.arpa>

add MX support

try multiple addresses in SMTP connect

Fix problem with not closing sockets upon errors when opening connections

statistics structure moved to its own header file so it may be used by
aux/mailstats

don't ignore aliasing during queue runs in conjunction with -bd

don't run around clearing EF_FATALERRS -- this often applies to another
address. Drop uid/gid check in sameaddr -- it causes more problems
than it fixes.

improve debugging in queue routines; don't output error addresses that
are duplicates or otherwise marked as "don't send"

do dbminit in a reasonable place

always ignore SIGCHLD in openmailer; get SccsId correct in alias.c

fix .forward files that include yourself; this was a bug in sameaddr
that may have caused some other problems

only check the RHS of aliases during newalias if the "n" option is set;
this option should probably be set if you are not running the nameserver

adjust WkTimeFact so that -q1h will lower relative priorities of
jobs over long periods, rather than leave them toward the top of the queue

allow multiple words per line in file classes; require a SCANF compilation
flag to use sscanf in F specs in order to reduce image size

apparently European timezones were wrong; thanks to Piet Beertema
<mcvax!piet@seismo.CSS.GOV> for this one

allow underscores in login names

rewrite reply-to and resent-reply-to; save errorqueueu in qf file;
some performance hacking; some alias handling cleanup; delete leading
spaces from SMTP lines