change debug level to a debug vector; add levels on logging (and the

change debug level to a debug vector; add levels on logging (and the
-L flag); change logging to be by message-id; elevate message-id;
some lint-type cleanup

SCCS-vsn: usr.sbin/sendmail/src/version.c 3.153
SCCS-vsn: usr.sbin/sendmail/src/main.c 3.94
SCCS-vsn: usr.sbin/sendmail/src/alias.c 3.36
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 3.96
SCCS-vsn: usr.sbin/sendmail/src/collect.c 3.44
SCCS-vsn: usr.sbin/sendmail/src/err.c 3.26
SCCS-vsn: usr.sbin/sendmail/src/clock.c 3.2
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 3.76
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 3.44
SCCS-vsn: usr.sbin/sendmail/src/savemail.c 3.40
SCCS-vsn: usr.sbin/sendmail/src/util.c 3.21
SCCS-vsn: usr.sbin/sendmail/src/srvrsmtp.c 3.24
SCCS-vsn: usr.sbin/sendmail/src/recipient.c 3.39
SCCS-vsn: usr.sbin/sendmail/src/daemon.c 3.22
SCCS-vsn: usr.sbin/sendmail/src/usersmtp.c 3.15
SCCS-vsn: usr.sbin/sendmail/src/macro.c 3.14
SCCS-vsn: usr.sbin/sendmail/src/headers.c 3.22
SCCS-vsn: usr.sbin/sendmail/src/stab.c 3.13
SCCS-vsn: usr.sbin/sendmail/src/queue.c 3.27