Changes in version 2.31.91 are:
 * Fix problem with keyring names that contain foreign charaters.
 * Build fixes and warning fixes.
 * Better GPG Agent prompt strings.
 * More internal documentation.
 * Remove gconf as part of migration to gsettings.
 * Add --replace option to daemon.
 * Fix race condition in tests.
 * Use new DER decoding and encoding routines.
 * Only try to authenticate once if PKCS#11 slot has
   protected auth path.
 * Better handling of when PKCS#11 token is write protected.