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.

1998/dlowe/README.md

@@ -58,7 +58,6 @@ make alt
 
 ### Alternate use:
 
-
 ```
 ./dlowe.alt < anyfile > pootfile
 ```