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/author-README.txt

@@ -1,14 +1,14 @@
 tac comes with a small suite of support programs to test and validate against.
 Untar tests and variations in the same dir as the sources,
-or change runtest and unob.sh to look elsewhere for the keyword and test files.
+or change runtest.sh and unob.sh to look elsewhere for the keyword and test files.
 
-keywords is a critical file, created from ioccc.kw.freq by mkkeywords.
+keywords is a critical file, created from ioccc.kw.freq by mkkeywords.sh.
 Only ioccc.kw.freq produces results compatible with iocccsize.c;
 however, any of the variations can be used instead:
 
-	mkkeywords c11 > keywords
+	mkkeywords.sh c11 > keywords
 
-unob.sh uses the same input file as mkkeywords to control spaces after keywords.
+unob.sh uses the same input file as mkkeywords.sh to control spaces after keywords.
 The script allows an environment variable, KW, to override this.
 Use it simply:
 
@@ -25,38 +25,38 @@ It does an amazingly good job for such a simple script.
 Manifest
 
 prog.c                  the reason for this README
-keywords		the file #included in prog.c, output of mkkeywords
-mkkeywords		reads one of the files from variations, produces string for prog.c
+keywords		the file #included in prog.c, output of mkkeywords.sh
+mkkeywords.sh		reads one of the files from variations, produces string for prog.c
 ioccc.kw.freq		keywords used by iocccsize, sorted by frequency in 201x ioccc winners
 unob.sh			a more robust unobfuscation script; requires variations/c11 in cur dir
-tokenfix		patches up prog -t output for ::, >>>, ...
+tokenfix.sh		patches up prog -t output for ::, >>>, ...
 src.doc.txt		the answers, or at least significant help
 tac.c			more clearly written code, offered as a replacement of iocccsize.c
 patch			fixes single quotes in iocccsize.c, adds #ifndef, removes "I"
 fixed_iocccsize.c	iocccsize with patch applied, and nop -c argument added
 
 tests/*
-runtest			script to run the tests; ./runtest | diff results -
+runtest.sh		script to run the tests; ./runtest.sh | diff results -
 results			results without -k
-results.k		results with -k; opt=kcrs ./runtest | diff results.k -
-test*.c			various test cases looking for compatability
+results.k		results with -k; opt=kcrs ./runtest.sh | diff results.k -
+test*.c			various test cases looking for compatibility
 iocccbug*.c		various test cases demonstrating problems with iocccsize
-spotcheck		script to test a lot of files vs iocccsize
-spotdiff		summarize the results of spotcheck, showing only differences
-discrepancies		text file of the differences found using all the ioccc winning entries
+spotcheck.sh		script to test a lot of files vs iocccsize
+spotdiff.sh		summarize the results of spotcheck.sh, showing only differences
+discrepancies.md	markdown file of the differences found using all the ioccc winning entries
 
 to test prog:
 
-	runtest | diff - results
-	opt=kcrs runtest | diff - results.k
-	find ~/src/obc -type f -a -name "*.c" | xargs spotcheck prog
-		[ | spotdiff | diff -bw - discrepancies ]
+	runtest.sh | diff - results
+	opt=kcrs runtest.sh | diff - results.k
+	find ~/src/obc -type f -a -name "*.c" | xargs spotcheck.sh prog
+		[ | spotdiff.sh | diff -bw - discrepancies ]
 
 to test tac:
 
-	prog=tac runtest | diff - results
-	prog=tac opt=krs runtest | diff - results.k
-	find ~/src/obc -type f -a -name "*.c" | xargs spotcheck tac
+	prog=tac runtest.sh | diff - results
+	prog=tac opt=krs runtest.sh | diff - results.k
+	find ~/src/obc -type f -a -name "*.c" | xargs spotcheck.sh tac
 
 variations/*		as described in the remarks, and in each file below
 ansi