ext/py-fft.c: remove doubled check

Signed-off-by: Paul Brossier <piem@piem.org>
ext/py-source.c: fix size checks

Signed-off-by: Paul Brossier <piem@piem.org>
lib/gen_pyobject.py: fix size checks

Signed-off-by: Paul Brossier <piem@piem.org>
ext/aubioproxy.c: improve sizes checks, cast to uint_t

Signed-off-by: Paul Brossier <piem@piem.org>
src/: sync header defines, remove trailing spaces, update copyrights

Signed-off-by: Paul Brossier <piem@piem.org>