Make m_ssl_gnutls work with at least GnuTLS v2.8
Merge pull request #58 from attilamolnar/2.0+gnutlsdep

[WIP] Make m_ssl_gnutls work with at least GnuTLS v2.8
Store a cert->account map and use it for SASL EXTERNAL and certfp auth
Regenerated language files.
webcpanel: Update copyright year.
ns_cert: Bold code 2 -> 002.