Add copyright notice

Add copyright notice

SCCS-vsn: lib/libplot/dumb/Makefile 5.1
SCCS-vsn: lib/libplot/dumb/dumb.h 5.1
SCCS-vsn: lib/libplot/dumb/arc.c 5.1
SCCS-vsn: lib/libplot/dumb/box.c 5.1
SCCS-vsn: lib/libplot/dumb/circle.c 5.1
SCCS-vsn: lib/libplot/dumb/close.c 5.1
SCCS-vsn: lib/libplot/dumb/cont.c 5.1
SCCS-vsn: lib/libplot/dumb/dot.c 5.1
SCCS-vsn: lib/libplot/dumb/erase.c 5.1
SCCS-vsn: lib/libplot/dumb/label.c 5.1
SCCS-vsn: lib/libplot/dumb/line.c 5.1
SCCS-vsn: lib/libplot/dumb/linemod.c 5.1
SCCS-vsn: lib/libplot/dumb/move.c 5.1
SCCS-vsn: lib/libplot/dumb/open.c 5.1
SCCS-vsn: lib/libplot/dumb/point.c 5.1
SCCS-vsn: lib/libplot/dumb/space.c 5.1
SCCS-vsn: lib/libplot/dumb/subr.c 5.1
SCCS-vsn: lib/libplot/gigi/gigi.h 5.1
SCCS-vsn: lib/libplot/gigi/Makefile 5.1
SCCS-vsn: lib/libplot/gigi/arc.c 5.1
SCCS-vsn: lib/libplot/gigi/box.c 5.1
SCCS-vsn: lib/libplot/gigi/circle.c 5.1
SCCS-vsn: lib/libplot/gigi/close.c 5.1
SCCS-vsn: lib/libplot/gigi/cont.c 5.1
SCCS-vsn: lib/libplot/gigi/dot.c 5.1
SCCS-vsn: lib/libplot/gigi/erase.c 5.1
SCCS-vsn: lib/libplot/gigi/label.c 5.1
SCCS-vsn: lib/libplot/gigi/line.c 5.1
SCCS-vsn: lib/libplot/gigi/linemod.c 5.1
SCCS-vsn: lib/libplot/gigi/move.c 5.1
SCCS-vsn: lib/libplot/gigi/open.c 5.1
SCCS-vsn: lib/libplot/gigi/point.c 5.1
SCCS-vsn: lib/libplot/gigi/space.c 5.1
SCCS-vsn: lib/libplot/hp2648/arc.c 5.1
SCCS-vsn: lib/libplot/hp2648/box.c 5.1
SCCS-vsn: lib/libplot/hp2648/circle.c 5.1
SCCS-vsn: lib/libplot/hp2648/close.c 5.1
SCCS-vsn: lib/libplot/hp2648/cont.c 5.1
SCCS-vsn: lib/libplot/hp2648/dot.c 5.1
SCCS-vsn: lib/libplot/hp2648/erase.c 5.1
SCCS-vsn: lib/libplot/hp2648/label.c 5.1
SCCS-vsn: lib/libplot/hp2648/line.c 5.1
SCCS-vsn: lib/libplot/hp2648/linemod.c 5.1
SCCS-vsn: lib/libplot/hp2648/move.c 5.1
SCCS-vsn: lib/libplot/hp2648/open.c 5.1
SCCS-vsn: lib/libplot/hp2648/point.c 5.1
SCCS-vsn: lib/libplot/hp2648/space.c 5.1
SCCS-vsn: lib/libplot/hp2648/subr.c 5.1
SCCS-vsn: lib/libplot/hp2648/Makefile 5.1
SCCS-vsn: lib/libplot/hp2648/hp2648.h 5.1
SCCS-vsn: lib/libplot/hp7221/arc.c 5.1
SCCS-vsn: lib/libplot/hp7221/box.c 5.1
SCCS-vsn: lib/libplot/hp7221/circle.c 5.1
SCCS-vsn: lib/libplot/hp7221/close.c 5.1
SCCS-vsn: lib/libplot/hp7221/cont.c 5.1
SCCS-vsn: lib/libplot/hp7221/dot.c 5.1
SCCS-vsn: lib/libplot/hp7221/erase.c 5.1
SCCS-vsn: lib/libplot/hp7221/label.c 5.1
SCCS-vsn: lib/libplot/hp7221/line.c 5.1
SCCS-vsn: lib/libplot/hp7221/linemod.c 5.1
SCCS-vsn: lib/libplot/hp7221/move.c 5.1
SCCS-vsn: lib/libplot/hp7221/open.c 5.1
SCCS-vsn: lib/libplot/hp7221/point.c 5.1
SCCS-vsn: lib/libplot/hp7221/space.c 5.1
SCCS-vsn: lib/libplot/hp7221/subr.c 5.1
SCCS-vsn: lib/libplot/hp7221/Makefile 5.1
SCCS-vsn: lib/libplot/hp7221/hp7221.h 5.1