verification mode used by gnutls_certificate_verify_peers2.
- Make it possible to send empty data through gnutls_record_send,
to align with the send(2) API.
+- Some changes in the certificate receiving part of handshake to prevent
+ some possible errors with non-blocking servers.
- The (experimental) low-level crypto alternative to libgcrypt used
earlier (Nettle) has been replaced with crypto code from gnulib.
This leads to easier re-use of these components in other projects,