Changes since 0.9.1:
* Support for Extended Key Usage.
* ksba_cms_identify may no return a pseudo content type for pkcs#12
files.
* Cleaned up the DN label table.
* Fixed a bug in creating CMS signed data.
* Interface changes:
ksba_reader_clear NEW.
ksba_cert_get_ext_key_usages NEW.
KSBA_CT_PKCS12 NEW.