* app-nks.c (get_length_of_cert): Removed.
* app-help.c: New.
(app_help_read_length_of_cert): New. Code taken from above. New
optional arg R_CERTOFF.
* card-dinsig.c: Removed.
* card.c (card_get_serial_and_stamp): Do not bind to the old and
never finsiged card-dinsig.c.
* iso7816.c (iso7816_read_binary): Allow for an NMAX > 254.