new copyright; att/bsd/shared

new copyright; att/bsd/shared

SCCS-vsn: usr.bin/w/w.c 5.28
SCCS-vsn: usr.bin/wall/wall.1 6.4
SCCS-vsn: usr.bin/wc/wc.1 6.2
SCCS-vsn: usr.bin/what/what.1 6.3
SCCS-vsn: old/whereis/whereis.1 6.4
SCCS-vsn: old/whereis/whereis.c 5.5
SCCS-vsn: old/which/which.1 6.2
SCCS-vsn: old/which/which.csh 5.5
SCCS-vsn: usr.bin/who/who.1 6.4
SCCS-vsn: old/whoami/whoami.1 6.3
SCCS-vsn: usr.bin/window/windowrc 3.9
SCCS-vsn: usr.bin/write/write.1 6.4
SCCS-vsn: usr.bin/xsend/common_source/lib.c 4.3
SCCS-vsn: usr.bin/xsend/common_source/xmail.h 4.2
SCCS-vsn: usr.bin/xsend/enroll/enroll.c 4.4
SCCS-vsn: usr.bin/xsend/xget/xget.c 4.6
SCCS-vsn: usr.bin/xsend/xsend/xsend.1 6.3
SCCS-vsn: usr.bin/xsend/xsend/xsend.c 4.8
SCCS-vsn: usr.bin/yes/yes.1 6.3