Many updates/fixes to 2018/burton2

This is a big commit but it should complete this entry and 2018 unless I
have missed something.

The make test rule was fixed. A script was not +x.

Renamed freqcount -> freqcount.sh (for browser/display).

Renamed mkkeywords -> mkkeywords.sh (for browser/display).

Renamed runtest -> runtest.sh (for browser/display).

Renamed spotcheck -> spotcheck.sh (for browser/display).

Renamed spotdiff -> spotdiff.sh (for browser/display).

Made tac.man proper man format and renamed tac.1.

Added tokcount.sh - a script that the author included in the remarks but
not in a script.

The renaming of files should be okay including the manifest (it is
believed this is true anyway).

Add try.sh script.

The READ_ME.txt was deleted as it had been renamed to author-README.txt
but the former was never deleted. This file was typo/format checked.

Format/typo check README.md file.

2018/burton2/try.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 2018/burton2
+#
+
+# 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="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+
+echo "$ ./prog -i < prog.c" 1>&2
+./prog -i < prog.c
+
+echo "$ ./prog -s < prog.c" 1>&2
+./prog -s < prog.c
+
+echo "$ ./prog -sk < prog.c" 1>&2
+./prog -sk < prog.c
+
+read -r -n 1 -p "Press any key to run: make test (space = next page, q = quit): "
+echo 1>&2
+make test | less -EXF