different meanings for photo and regular IDs, rename --default-check-level
to --default-cert-check-level, add --auto-check-trustdb, and --pgp6.
* DETAILS: Add EXPSIG, EXPKEYSIG, and KEYEXPIRED. Add notes to SIGEXPIRED
(deprecated), and VALIDSIG (added expiration date). Add "Preferences"
command to unattended key generation instructions. Also fixed a few
typos.
* samplekeys.asc: new
