Add copyright

Add copyright

SCCS-vsn: usr.bin/mail/names.c 5.1
SCCS-vsn: usr.bin/mail/optim.c 5.1
SCCS-vsn: usr.bin/mail/popen.c 5.1
SCCS-vsn: usr.bin/mail/quit.c 5.1
SCCS-vsn: usr.bin/mail/send.c 5.1
SCCS-vsn: usr.bin/mail/sigretro.c 5.1
SCCS-vsn: usr.bin/mail/strings.c 5.1
SCCS-vsn: usr.bin/mail/temp.c 5.1
SCCS-vsn: usr.bin/mail/tty.c 5.1
SCCS-vsn: usr.bin/mail/v7.local.c 5.1
SCCS-vsn: usr.bin/mail/vars.c 5.1
SCCS-vsn: usr.bin/mail/version.c 5.1
SCCS-vsn: usr.bin/mail/configdefs.h 5.1
SCCS-vsn: usr.bin/mail/def.h 5.1
SCCS-vsn: usr.bin/mail/glob.h 5.1
SCCS-vsn: usr.bin/mail/local.h 5.1
SCCS-vsn: usr.bin/mail/rcv.h 5.1
SCCS-vsn: usr.bin/mail/sigretro.h 5.1
SCCS-vsn: usr.bin/mail/pathnames.h 5.1
SCCS-vsn: usr.bin/mail/Makefile.11 5.1
SCCS-vsn: bin/ps/ps.c 5.1
SCCS-vsn: old/analyze/analyze.c 5.1
SCCS-vsn: old/arff/arff.c 5.1
SCCS-vsn: usr.sbin/bad144/bad144.c 5.1