scd: Improve the prompts for OpenPGP cards.
* scd/app-openpgp.c (get_disp_name): New. (get_disp_serialno): New. (get_prompt_info): New. (build_enter_admin_pin_prompt): Rework the prompt texts. Factor some code out to ... (get_remaining_tries): New. (verify_a_chv): Print a remaining counter also for the standard PIN. Rework the prompt texts. * agent/divert-scd.c (ask_for_card): Pretty format an OpenPGP serial no.
- Signed-off-by: Werner Koch <wk@gnupg.org>