format headers

We move `tmp/format-headers.sh` into `bin/format-headers.sh`.

We also add a few missing empty lines to `README.md`.

We add `bin/format-headers.sh` to the `bin/README.md`.

We run `bin/format-headers.sh` to perform the above.

Performed `make www` to accomplish the above and to test under macOS.

1994/tvr/README.md

@@ -37,7 +37,6 @@ Mode may be a value from 0 to 12.
 
 ## Alternate code:
 
-
 ### NOTICE to those who wish for a greater challenge:
 
 **If you want a greater challenge, don't read any further**: