Merge branch 'armor-signedness' into master-updates

ChangeLog

base16-decode.c

base16-encode.c

base16-meta.c

base16.h

base64-decode.c

base64-encode.c

base64.h

base64url-encode.c

examples/base16dec.c

examples/base16enc.c

examples/base64dec.c

examples/base64enc.c

nettle-types.h

pgp-encode.c

sexp-transport-format.c

sexp-transport.c

testsuite/base64-test.c

testsuite/testutils.c

testsuite/testutils.h