* g10/options.h (opt): Add field only_sign_text_ids.
* g10/gpg.c (enum cmd_and_opt_values): Add value oOnlySignTextIDs.
(opts): Handle oOnlySignTextIDs.
(main): Likewise.
* g10/keyedit.c (sign_uids): If OPT.ONLY_SIGN_TEXT_IDS is set, don't
select non-text based IDs automatically.
(keyedit_menu): Adapt the prompt asking to sign all user ids according
to OPT.ONLY_SIGN_TEXT_IDS.
* doc/gpg.texi: Document the new option --only-sign-text-ids.