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

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

SCCS-vsn: games/trek/out.c 8.1
SCCS-vsn: games/trek/phaser.c 8.1
SCCS-vsn: games/trek/play.c 8.1
SCCS-vsn: games/trek/ram.c 8.1
SCCS-vsn: games/trek/ranf.c 8.1
SCCS-vsn: games/trek/rest.c 8.1
SCCS-vsn: games/trek/schedule.c 8.1
SCCS-vsn: games/trek/score.c 8.1
SCCS-vsn: games/trek/setup.c 8.1
SCCS-vsn: games/trek/setwarp.c 8.1
SCCS-vsn: games/trek/shield.c 8.1
SCCS-vsn: games/trek/snova.c 8.1
SCCS-vsn: games/trek/srscan.c 8.1
SCCS-vsn: games/trek/systemname.c 8.1
SCCS-vsn: games/trek/torped.c 8.1
SCCS-vsn: games/trek/trek.h 8.1
SCCS-vsn: games/trek/utility.c 8.1
SCCS-vsn: games/trek/visual.c 8.1
SCCS-vsn: games/trek/warp.c 8.1
SCCS-vsn: games/trek/win.c 8.1