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.

2012/zeitak/README.md

@@ -41,6 +41,7 @@ this extremely subtle entry.
 make alt
 ```
 
+
 ### Alternate use:
 
 Use `zeitak.alt` as you would `zeitak` above.
@@ -59,7 +60,6 @@ just to understand 18 key characters of this code.
 
 ## Author's remarks:
 
-
 ### Nesting Errors Detector