Fix tmp/format-headers.sh, format headers

The script had "s surrounding the git ls-files command which turned it
to a single file which of course is wrong.

Ran script again fixing many README.md files that had incorrect number
of blank lines for critical headers.

This will have to be done a final but a good number of files have been
corrected.

2000/jarijyrki/README.md

@@ -58,7 +58,6 @@ program needs now is a [flight simulator](1998/banks/README.md)!
 
 ## Author's remarks:
 
-
 ### 1. OVERVIEW
 
 This program is an X-Windows based spreadsheet program.  The main functions it

2000/natori/README.md

@@ -18,7 +18,6 @@ version](#alternate-code) below.
 
 ### Try:
 
-
 ```sh
 ./try.sh
 ```

2000/primenum/README.md

@@ -45,7 +45,6 @@ it successfully fooled half of the judges, including me.
 
 ## Author's remarks:
 
-
 ### Description
 
 For 15 years, IOCCC winners have obfuscated programs using esoteric,

2000/robison/README.md

@@ -26,7 +26,6 @@ author a patent he applied for.  :-)
 
 ## Author's remarks:
 
-
 ### TITLE OF INVENTION
 
 Highly Compressed Program for Playing Hygienic Checkers

2000/thadgavin/README.md

@@ -22,6 +22,7 @@ We recommend that you use the alternate code in modern systems. See the
 
 You can press 'q' at any time to exit.
 
+
 ### Try:
 
 If you have SDL1 installed:
@@ -77,12 +78,14 @@ problem there.
 make all
 ```
 
+
 ### Original use:
 
 ```sh
 ./thadgavin
 ```
 
+
 ### Original try:
 
 If you have SDL1 installed:
@@ -102,7 +105,6 @@ less than dazzling. We could not test this entry in DOS mode.
 
 ## Authors' remarks:
 
-
 ### To use under DOS:
 
 Compile using DJGPP as follows: