Many changes resulting from a complete code readthrough. Most of these

Many changes resulting from a complete code readthrough.  Most of these
fix minor bugs or change the internal structure for clarity, etc.  There
should be almost no externally visible changes (other than some cleaner
error message printouts and the like).

SCCS-vsn: usr.sbin/sendmail/src/main.c 3.141
SCCS-vsn: usr.sbin/sendmail/src/alias.c 3.42
SCCS-vsn: usr.sbin/sendmail/src/conf.c 3.65
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 3.133
SCCS-vsn: usr.sbin/sendmail/src/collect.c 3.55
SCCS-vsn: usr.sbin/sendmail/src/err.c 3.36
SCCS-vsn: usr.sbin/sendmail/src/convtime.c 3.3
SCCS-vsn: usr.sbin/sendmail/src/clock.c 3.13
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 3.102
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 3.67
SCCS-vsn: usr.sbin/sendmail/src/savemail.c 3.50
SCCS-vsn: usr.sbin/sendmail/src/version.c 3.253
SCCS-vsn: usr.sbin/sendmail/src/util.c 3.35
SCCS-vsn: usr.sbin/sendmail/src/queue.c 3.54
SCCS-vsn: usr.sbin/sendmail/src/srvrsmtp.c 3.39
SCCS-vsn: usr.sbin/sendmail/src/recipient.c 3.48
SCCS-vsn: usr.sbin/sendmail/src/usersmtp.c 3.28
SCCS-vsn: usr.sbin/sendmail/src/readcf.c 3.48
SCCS-vsn: usr.sbin/sendmail/src/macro.c 3.18
SCCS-vsn: usr.sbin/sendmail/src/headers.c 3.40
SCCS-vsn: usr.sbin/sendmail/src/stats.c 3.5