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.

1988/spinellis/README.md

@@ -10,7 +10,7 @@ If your compiler will not read from `/dev/tty` see the [Alternate
 code](#alternate-code) section below.
 
 
-### To use:
+## To use:
 
 ```sh
 ./spinellis

1988/westley/README.md

@@ -76,7 +76,6 @@ cc -E westley.alt.c
 ```
 
 
-
 ## Author's remarks:
 
 No remarks were provided by the author.