* src/cert.h (struct cert): Add member certref.
* src/agent.h (struct agent_card_info_s): Remove legacy data.
* src/agent.c (learn_status_cb): Ditto.
(scute_agent_get_cert): Copy the certref to the cert object.
* src/cert-object.c (scute_attr_cert): Add arg 'grip' and use new
scheme for CKA_ID.
(scute_attr_prv): Ditto.
* src/gpgsm.c (struct search): Rename to search_cb_parm for clarity.
Add member 'grip'.
(search_cb): Pass GRIP to scute_attr_prv and scute_attr_cert.
(scute_gpgsm_get_cert): Convey GRIP.
* src/slots.c (slot_init): Replace fixed "OPENPGP.3" by a loop over
all available keyrefs.
(session_sign): Actually use the set key.  Add a few checks.
* src/settings.h (LIBRARY_DESCRIPTION): Rename to "GnuPG".
* src/slots.c (mechanism_alloc): Change ulMaxKeySize to 4096.
* src/p11-gettokeninfo.c (C_GetTokenInfo): Set ulMaxSessionCount to
CK_EFFECTIVELY_INFINITE.
* tests/t-getattribute.c (dump_one_string): New.
(dump_object): Use for some objects.