Corrected error checking in _gnutls_x509_ext_gen_proxyCertInfo

Conflicts:
	lib/x509/extensions.c
corrected return codes.
Allow all ciphersuites in SSL3.0 when they are available in TLS1.0
doc update
added release date
doc update
check the blacklist for certificates provided in gnutls_x509_trust_list_verify_named_crt().