Remove 1986/hague alt code, make main entry

I fixed it so that the form where it would segfault (after printing the
correct output) no longer occurs.

The thanks file has had a note added towards the top about changing to
fgets(), noting that although more is mentioned in the FAQ, it can be a
real problem with some systems. The best example of it being beneficial
is 1990/tbr. Naturally I also updated the thanks file for 1986/hague
too, updating the details.

1986/hague/Makefile

@@ -63,7 +63,7 @@ CDEFINE=
 
 # Include files that are needed to compile
 #
-CINCLUDE= -include stdio.h -include unistd.h
+CINCLUDE= -include stdio.h -include unistd.h -include string.h
 
 # Optimization
 #
@@ -114,8 +114,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ= ${PROG}.alt.o
-ALT_TARGET= ${PROG}.alt
+ALT_OBJ=
+ALT_TARGET=
 
 
 #################
@@ -131,8 +131,6 @@ all: data ${TARGET}
 	sandwich supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "NOTE: this entry uses gets() so you might get a warning about this"
-	@echo "      when compiling and running this program with some systems."
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
 
 # alternative executable