* agent/command.c (cmd_havekey): Add new option --info.
* tools/card-call-scd.c (scd_readkey): Allow using without result arg.
(struct havekey_status_parm_s): New.
(havekey_status_cb): New.
(scd_havekey_info): New.
(scd_delete_key): New.
* tools/gpg-card.c (print_keygrip): Add arg with_lf.
(cmd_checkkeys): New.
(cmdCHECKKEYS): New.
(cmds): Add command "checkkeys".
(dispatch_command, interactive_loop): Call cmd_checkkeys.