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

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

SCCS-vsn: games/tetris/tetris.6 8.1
SCCS-vsn: games/trek/abandon.c 8.1
SCCS-vsn: games/trek/attack.c 8.1
SCCS-vsn: games/trek/autover.c 8.1
SCCS-vsn: games/trek/capture.c 8.1
SCCS-vsn: games/trek/cgetc.c 8.1
SCCS-vsn: games/trek/check_out.c 8.1
SCCS-vsn: games/trek/checkcond.c 8.1
SCCS-vsn: games/trek/compkl.c 8.1
SCCS-vsn: games/trek/computer.c 8.1
SCCS-vsn: games/trek/damage.c 8.1
SCCS-vsn: games/trek/damaged.c 8.1
SCCS-vsn: games/trek/dcrept.c 8.1
SCCS-vsn: games/trek/destruct.c 8.1
SCCS-vsn: games/trek/dock.c 8.1
SCCS-vsn: games/trek/dumpgame.c 8.1
SCCS-vsn: games/trek/dumpme.c 8.1
SCCS-vsn: games/trek/dumpssradio.c 8.1
SCCS-vsn: games/trek/events.c 8.1
SCCS-vsn: games/trek/externs.c 8.1
SCCS-vsn: games/trek/getcodi.c 8.1
SCCS-vsn: games/trek/getpar.c 8.1
SCCS-vsn: games/trek/getpar.h 8.1
SCCS-vsn: games/trek/help.c 8.1
SCCS-vsn: games/trek/impulse.c 8.1
SCCS-vsn: games/trek/initquad.c 8.1
SCCS-vsn: games/trek/kill.c 8.1
SCCS-vsn: games/trek/klmove.c 8.1
SCCS-vsn: games/trek/lose.c 8.1
SCCS-vsn: games/trek/lrscan.c 8.1
SCCS-vsn: games/trek/main.c 8.1
SCCS-vsn: games/trek/move.c 8.1
SCCS-vsn: games/trek/nova.c 8.1