Update copyright/licensing blurbs with newer GPLv3+.
drwxr-xr-x - .be
-rw-r--r-- 394 .gitignore
-rw-r--r-- 35147 COPYING
-rw-r--r-- 756 README
-rw-r--r-- 237 README.git
drwxr-xr-x - src
drwxr-xr-x - testing