Fix 1994/horton/Makefile and README.md

The alt code was being compiled with 'all' rather than 'alt'.

The README.md file also has had format updates including referring to
the alt code as well as the gtface.c.

This should complete 1994/horton.

1994/horton/Makefile

@@ -114,10 +114,10 @@ PROG= ${ENTRY}
 #
 OBJ= ${PROG}.o
 DATA= gtface.data
-TARGET= ${PROG} gtface ${PROG}.alt
+TARGET= ${PROG} gtface
 #
-ALT_OBJ= ${PROG}.alt.o
-ALT_TARGET= ${PROG}.alt
+ALT_OBJ= ${PROG}.alt.o gtface.o
+ALT_TARGET= ${PROG}.alt gtface
 
 
 #################

1994/horton/README.md

@@ -14,22 +14,42 @@ make all
 `A`, `B`, `C` and `D` are numeric arguments.
 
 
+
+### Try:
+
+
 ```sh
 ./horton 3 2 1 0
 ```
 
+Also try:
+
+```sh
+./gtface  < gtface.data
+```
 
 ## Alternate code:
 
 This confuses cb greatly. See [horton.alt.c](horton.alt.c) for an unobfuscated/enhanced
-version. To run this alternate version:
+version.
+
+
+### Alternate build:
+
 
 ```sh
 make alt
+```
+
+
+### Alternate use:
+
+
+```sh
 ./horton.alt A B C D
 ```
 
-Use `horton.alt` as you would `horton` above.
+Where A, B, C and D are like with `horton`.
 
 
 ## Judges' remarks: