* export.c (do_export_stream), keyedit.c (show_key_with_all_names,
menu_addrevoker), mainproc.c (check_sig_and_print), photoid.c
(show_photos), sign.c (mk_notation_and_policy), trustdb.c (get_validity,
reset_trust_records, validate_keys): Make some strings translatable.
* mainproc.c (check_sig_and_print): Show digest algorithm and sig class
when verifying a sig with --verbose on, and add version, pk and hash
algorithms and sig class to VALIDSIG.
* parse-packet.c (enum_sig_subpkt): Make a warning message a --verbose
warning message since we don't need to warn every time we see an unknown
critical (we only need to invalidate the signature).
* trustdb.c (init_trustdb): Check the trustdb options even with TM_AUTO
since the auto may become TM_CLASSIC or TM_OPENPGP.
'@', unless --expert is set. This is to help prevent people from
polluting the (as yet unused) IETF namespace.
* main.h: Comments about default algorithms.
* photoid.c (image_type_to_string): Comments about 3-letter file
extensions.
FIXED_PHOTO_VIEWER and DISABLE_PHOTO_VIEWER.
* mainproc.c (check_sig_and_print): Use --show-photos to show photos when
verifying a sig made by a key with a photo.
* keyserver.c (parse_keyserver_uri): Properly parse a URI with no :port
section and an empty file path, but with a terminating '/'.
(keyserver_work): Honor DISABLE_KEYSERVER_HELPERS.
* hkp.c (hkp_ask_import): Display keyserver URI as a URI, but only if
verbose.
* exec.c, g10.c: USE_EXEC_PATH -> FIXED_EXEC_PATH
