arrange to cleanup addresses using ruleset 4 before storing in ADDR struct

Fix bug in $w and $=w setup; truncate output to seven bits if the "limits"
flag is set to insure that nothing can be sent that looks like TELNET
protocol

Avoid loops in the auto-closedown code

Avoid core dumps on very long addresses in headers.

Improve host verification -- put something in even if no HELO command given

Add HELO hostname verification; give an error if a message terminates with
EOF rather than dot in SMTP mode; put in a catch for "Not owner" error on
connect -- see if we can find anything funny.

fix clrbitmap to really clear the entire bitmap

avoid core dump on return receipt processing; clean up return receipt
message.

clean up problems when QUEUE compile flag not defined; clean up hostname
code to run on non-4.1c systems; fix use of -oeq (quiet on errors) flag.

Change version stamp to have no date (so that it looks nice as $v/$V)

$e macro is now SMTP entry message (so that configuration version can
be included).

Make mailer size limits a per-mailer parameter (M field in the mailer
descriptor)

implement classes and mailer flags as a bit map; define new class 'w'
as the set of all hosts we are known by

don't call printqueue() if queueing is turned off

pause() after reply error if 18.100 set -- so that Sam can try to track
down the state of the connection in the CMU-CS-A problem.

Set the $w macro to the hostname if at all possible to allow generic
configuration tables.

fix bug that caused "\r\n" string in TCP mailer definition to turn
into something else -- causing all TCP connections to hang.

define a newline in "nullmailer" so that queue files get written with
newlines between the "H" lines.

put in socket debugging on a debug flag to help Sam find the CMU-CS-A
problem -- this probably won't work with early 4.1c systems.

make the maximum number of simultaneous SMTP connections an option

Change mailer spec to have labelled fields for future expansion.
**** This delta invalidates previous configuration files ****

be sure everything gets appropriately externalized; canonname goes away,
since everything is now done by remotename

fix date format to be truly RFC822

fix CRLF problem when sending SMTP commands; make newstr() and crlf()
into macros

release daemon resources when running the queue