** Genkey should return something more useful than General_Error.
** Factor out common code in _op_*_start functions.
** Add ATTR to return the number of subkeys or uids.
-** "When returning a GpgmeKey GPGME_ATTR_COMMENT attribute, characters
- like ":" are not un-escaped, they are returned as \x3a" Bug
- reported by Stephane Corthesy.
* Error Values
** Map ASSUAN/GpgSM ERR error values in a better way than is done now. !!