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.

2015/duble/README.md

@@ -40,7 +40,7 @@ make alt
 Use `prog.alt` as you would `prog` above.
 
 
-### Judges' remarks:
+## Judges' remarks:
 
 Beautiful penmanship! However, your fonts may vary.