change inheritance for macros in envelopes; be able to canonicalize

change inheritance for macros in envelopes; be able to canonicalize
non-domained names by appending domain from sender; call ruleset 3
explicitly before doing other rulesets; some general cleanup.

SCCS-vsn: usr.sbin/sendmail/src/main.c 3.113
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 3.113
SCCS-vsn: usr.sbin/sendmail/src/collect.c 3.52
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 3.87
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 3.55
SCCS-vsn: usr.sbin/sendmail/src/version.c 3.198
SCCS-vsn: usr.sbin/sendmail/src/readcf.c 3.31
SCCS-vsn: usr.sbin/sendmail/src/macro.c 3.17