Use common GPL-header format in CK804 files, add missing ones (trivial).
-rw-r--r-- 17987 COPYING
-rw-r--r-- 13597 Makefile
-rw-r--r-- 2576 README
drwxr-xr-x - documentation
drwxr-xr-x - payloads
drwxr-xr-x - src
drwxr-xr-x - util