Bug fix 2001/ctk and alt code added

Fixed bug where if one does not hit 'q' it would mess up the terminal on
exit. I think (but I'm also distracted) this happened if you crashed as
well. Now if you kill the game (ctrl-c for instance), you crash or you
quit with 'q' it should still be a sane terminal.

The alt code adds (it does not replace) vi(m) movement keys: h for left,
l for right and k for straight.

Format/typo check README.md file.

2001/ctk/Makefile

@@ -114,8 +114,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################
@@ -138,6 +138,9 @@ ${PROG}: ${PROG}.c
 alt: data ${ALT_TARGET}
 	@${TRUE}
 
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
+
 # data files
 #
 data: ${DATA}