Add new keylist mode GPGME_KEYLIST_MODE_WITH_SECRET.
* src/gpgme.h.in (GPGME_KEYLIST_MODE_WITH_SECRET): New. * src/engine-gpg.c (gpg_keylist_build_options): Handle new mode. * src/engine-gpgsm.c (gpgsm_keylist, gpgsm_keylist_ext): Ditto. * src/keylist.c (parse_sec_field15): Add arg key and take care of --with-secret output. * src/gpgme-tool.c (gt_get_keylist_mode, cmd_keylist_mode): Add "with_secret". Print card info and and secret flag for subkeys.
Note: This mode may only be used with GnuPG >= 2.1.