scd: New option to APDU command to return the ATR as data.
* scd/command.c (cmd_apdu): Add new option --data-atr. * tools/gpg-card.c (cmd_apdu): Use that here. Also fix the --exlen option and do not print the statusword in atr mode. * tools/card-call-scd.c (scd_apdu): Detect atr mode anddon't assume a status word.
- Signed-off-by: Werner Koch <wk@gnupg.org>