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.

1985/sicherman/README.md

@@ -36,7 +36,6 @@ The [sicherman.alt.c](%%REPO_URL%%/1985/sicherman/sicherman.alt.c) is a slight c
 
 ### Alternate build:
 
-
 ``` <!---sh-->
     make alt
 ```