correct the full name of the GPL in various files

correct the full name of the GPL in various files

Last year, commit f4cb44bd11 corrected the full name of the GPL in
a dozen files, but still left the mistaken name in eight places.

(Also, in the first file, just reshuffle the license line, to be
in the same position as in other files.)

Signed-off-by: Benno Schulenberg <bensberg@telfort.nl>
(cherry picked from commit c4b2b66bad23e605dd6392921d0750770145e4a1)