* gpgme_key_t and gpgme_subkey_t have a new field, can_authenticate,
that indicates if the key can be used for authentication.
+ * gpgme_signature_t's status field is now correctly set to an error
+ with error code GPG_ERR_NO_PUBKEY if public key is not found.
+
* Interface changes relative to the 0.4.3 release:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gpgme_get_key CHANGED: Fails correctly if key ID not unique.