Update 1984 README.md files and one Makefile

Just some clean up and general notes as well as add a 'To run:' section
to each README.md.

1984/laman/Makefile

@@ -183,6 +183,8 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
+	@echo "NOTE: this entry will likely dump core without an arg and it will not work without"
+	@echo "a positive number."
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable