mini-record-2 movedto front.
doc update
use gnutls_strdup
simplified gnutls_certificate_set_x509_trust_file/mem.
simplified gnutls_certificate_set_x509_crl_file/mem.
gnutls_pkcs11_crt_exists renamed to gnutls_pkcs11_crt_is_known

Moreover it was modified to fully compare the certificate when looking
for a trusted certificate.