Add padding to base64 encoding
* src/util.c (base64_encode): Change to use padding. (base64_decode): Remove kludge. * src/t-util.c (do_test_base64_encoding): New. (test_base64_encoding): More tests.
It does not make sense to save 2 padding bytes in exchange for being
non standard compliant.
- Signed-off-by: Werner Koch <wk@gnupg.org>