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.

2013/endoh2/README.md

@@ -32,7 +32,6 @@ Next look at `jpeg.jpg` in an image viewer program.
 
 ## Judges' remarks:
 
-
 This is a program which, when fed its own source, generates a program that
 almost is its whitespace inverse, which, in its order, generates a JPEG file
 (speaking of file size abuse, that is about 16.4 times larger than a PBM file