scd: Extend KEYPAIRINFO by key usage info.
* scd/app-openpgp.c (send_keypair_info): Append usage string. * scd/app-piv.c (struct data_object_s): Remove column 'binary'. Add column 'usage'. (dump_all_do): Adjust for removed 'binary'. (send_keypair_and_cert_info): Append usage string.
- Signed-off-by: Werner Koch <wk@gnupg.org>