4.4BSD snapshot (revision 8.1); add 1993 to copyright

4.4BSD snapshot (revision 8.1); add 1993 to copyright

SCCS-vsn: usr.bin/window/wwdata.c 8.1
SCCS-vsn: usr.bin/window/wwdelchar.c 8.1
SCCS-vsn: usr.bin/window/wwdelete.c 8.1
SCCS-vsn: usr.bin/window/wwdelline.c 8.1
SCCS-vsn: usr.bin/window/wwdump.c 8.1
SCCS-vsn: usr.bin/window/wwend.c 8.1
SCCS-vsn: usr.bin/window/wwenviron.c 8.1
SCCS-vsn: usr.bin/window/wwerror.c 8.1
SCCS-vsn: usr.bin/window/wwflush.c 8.1
SCCS-vsn: usr.bin/window/wwframe.c 8.1
SCCS-vsn: usr.bin/window/wwgets.c 8.1
SCCS-vsn: usr.bin/window/wwinit.c 8.1
SCCS-vsn: usr.bin/window/wwinschar.c 8.1
SCCS-vsn: usr.bin/window/wwinsline.c 8.1
SCCS-vsn: usr.bin/window/wwiomux.c 8.1
SCCS-vsn: usr.bin/window/wwlabel.c 8.1
SCCS-vsn: usr.bin/window/wwmisc.c 8.1
SCCS-vsn: usr.bin/window/wwmove.c 8.1
SCCS-vsn: usr.bin/window/wwopen.c 8.1
SCCS-vsn: usr.bin/window/wwprintf.c 8.1
SCCS-vsn: usr.bin/window/wwpty.c 8.1
SCCS-vsn: usr.bin/window/wwputc.c 8.1
SCCS-vsn: usr.bin/window/wwputs.c 8.1
SCCS-vsn: usr.bin/window/wwredraw.c 8.1
SCCS-vsn: usr.bin/window/wwredrawwin.c 8.1
SCCS-vsn: usr.bin/window/wwrint.c 8.1
SCCS-vsn: usr.bin/window/wwscroll.c 8.1
SCCS-vsn: usr.bin/window/wwsize.c 8.1
SCCS-vsn: usr.bin/window/wwspawn.c 8.1
SCCS-vsn: usr.bin/window/wwsuspend.c 8.1
SCCS-vsn: usr.bin/window/wwterminfo.c 8.1
SCCS-vsn: usr.bin/window/wwtty.c 8.1
SCCS-vsn: usr.bin/window/wwunframe.c 8.1
SCCS-vsn: usr.bin/window/wwupdate.c 8.1
SCCS-vsn: usr.bin/window/wwwrite.c 8.1
SCCS-vsn: usr.bin/window/xx.c 8.1
SCCS-vsn: usr.bin/window/xx.h 8.1
SCCS-vsn: usr.bin/window/xxflush.c 8.1