card: Better detect removed cards. Add TCOS PIN menu.

* tools/card-call-scd.c (scd_change_pin): Add arg 'nullpin'.
* tools/gpg-card.h (struct card_info_s): Add field 'card_removed'.
* tools/gpg-card.c (fixup_scd_errors): New.
(maybe_set_card_removed): New.
(list_one_kinfo): Change type of first arg to get access to INFO.  Set
card_removed flag.
(list_all_kinfo): Improve label alignment.
(cmd_list): Check that the current card is still available.
(cmd_passwd): Add option --nullpin and menu to chnage TCOS PINs.
(dispatch_command): Handle card_removed flag.
(interactive_loop): Ditto.
--

Note that that I was not able to change the NullPIN of the standard
PIN using a Signature V2 Brainpool test card.  Changing the NullPIN of
the QES PIN worked, though.  I checked the commands send to scdaemon
and they were correct - I used the very same command with
gpg-connect-agent last week to set a Pin for a production Brainpool
Signature card.  Thus this might be a problem with this specific test
card.

Signed-off-by: Werner Koch <[email protected]>

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