which can not be differentiated from the case that it is not
representable.
** Agree on gpgme_key_unref or gpgme_key_release and drop the other?
+** keylisting mode can go
+** api to specify where to search, lokal and/or remote.
* Implement posix-sema.c
** engine operations can return General Error on unknown protocol
(it's an internal error, as select_protocol checks already).
+* Operations
+** Import, export status handler.
+
* Error Values
** Map ASSUAN error values.
** Map GpgSM ERR messages.