Arrange to strip quote bits in message header; move SPACESUB into

Arrange to strip quote bits in message header; move SPACESUB into
conf.c; change SpaceSub to unquoted dot

SCCS-mr: usr.sbin/sendmail/src/conf.c 049
SCCS-mr: usr.sbin/sendmail/src/deliver.c 049
SCCS-mr: usr.sbin/sendmail/src/sendmail.h 049
SCCS-mr: usr.sbin/sendmail/src/parseaddr.c 049
SCCS-mr: usr.sbin/sendmail/src/version.c 049
SCCS-mr: usr.sbin/sendmail/src/util.c 049
SCCS-mr: usr.sbin/sendmail/src/recipient.c 049
SCCS-vsn: usr.sbin/sendmail/src/conf.c 3.61
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 3.125
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 3.94
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 3.63
SCCS-vsn: usr.sbin/sendmail/src/version.c 3.233
SCCS-vsn: usr.sbin/sendmail/src/util.c 3.33
SCCS-vsn: usr.sbin/sendmail/src/recipient.c 3.43