Add 1994/horton/try scripts and article cited

The try.sh and try.alt.sh scripts correspond to the original entry and
the alt code (which is enhanced).

The PDF files might need a bit more explaining. The author wrote an
article in 'The USENIX Association Newsletter ;login: September /
October 1992 Vol. 17, No. 5' (the exact title from the PDF) called
'Using GraphTab'. I found the full newsletter in the Internet Wayback
Machine which is now added to the repo (okay: the newsletter as a PDF is
added to the repo, not the Internet Wayback Machine :-) ). But the pages
cited are 28-31 so I extracted (with macOS Preview app: File -> Print
option) the specific pages so one need not look at the full newsletter
if they do not wish to. It felt better to have the PDF rather than
images as it's easier to deal with what the right size is: the size is
there and one can zoom in or out as they see fit (whereas with images
different resolutions make it easier or harder to see what is in them).

1994/horton/try.sh

@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 1994/horton
+#
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+make CC="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+
+read -r -n 1 -p "Press any key to run: ./horton 3 2 1 0: "
+echo 1>&2
+./horton 3 2 1 0
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./horton 0 1 2 3: "
+echo 1>&2
+./horton 0 1 2 3
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./horton -1 -2 -4 -8: "
+echo 1>&2
+./horton -1 -2 -4 -8
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./horton -8 -4 -2 -1: "
+echo 1>&2
+./horton -8 -4 -2 -1
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./horton 42 -42 42 -42: "
+echo 1>&2
+./horton 42 -42 42 -42
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./horton -42 42 -42 42: "
+echo 1>&2
+./horton -42 42 -42 42
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./horton 100 -100 -200 200: "
+echo 1>&2
+./horton 100 -100 -200 200
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./horton -100 100 200 -200: "
+echo 1>&2
+./horton -100 100 200 -200
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./horton -4 4 -4 4: "
+echo 1>&2
+./horton -4 4 -4 4
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./horton 4 -4 4 -4: "
+echo 1>&2
+./horton 4 -4 4 -4
+echo 1>&2
+
+read -r -n 1 -p "Press any key to show gtface.c (space = next page, q = quit): "
+echo 1>&2
+less -rEXF gtface.c
+echo 1>&2
+
+read -r -n 1 -p "Press any key to show gtface.data (space = next page, q = quit): "
+echo 1>&2
+less -rEXF gtface.data
+echo 1>&2
+read -r -n 1 -p "Press any key to run: ./gtface < gtface.data: "
+echo 1>&2
+./gtface < gtface.data
+echo 1>&2