Minor testsuite fixes.  Stricter checking on aux-item cross-reference.
Typos fixed.

	with a space.

(is_member_in_linked_recpt): New argument: tno.  All callers
	updated.  For now, do nothing special with cross-reference;
	until but 23 is fixed that would be pointless.  Report bad
	aux-items with report_bad_aux.  Added missing breaks.
(interested_party): New argument: tno.  All callers updated.

move files into the result package, to preserve time stamps.  Create
corefiles.txt if any core files are found.

async-add-recipient and async-sub-recipient to recipients of text
linked to the relevant text.  (Bug 59).

(person_text_read_access): Ditto.

(is_member_in_recpt): Use is_member_in to simplify code.
(is_member_in_recpt_of): New static function.
(is_member_in_linked_recpt): New static function.
(interested_party): New static function. This also considers if
	the potential message recipient is a member of a recipient of a
	text that is linked to the text, via a misc-info or a aux-item.
(send_async_sub_recipient): Use interested_party to determine if
	the asynchronous message should be sent.
(send_async_deleted_text): Ditto.
(send_async_new_text_old): Ditto.
(send_async_new_text): Ditto.
(send_async_add_recipient): Ditto.
(text_read_access): Added const qualifiers.

when detecting runtest.

Made aux-items.conf more strict.  (Bug 451).

	to passive-message-invert. Document it.
(async-send-message): Mention that the passive and
	passive-message-invert bits of the Membership-Type influences
	if messages are sent or not.
(send-message): Mention passive and passive-message-invert.
	Mention async-send-message.
(Error Codes): Don't say "group message".

(no-comment): This must be unique and contain no data.
(personal-comment): Ditto.
(request-confirmation): Ditto.
(read-confirm): This must contain no data.
(redirect): Clear inherit, secret and hide-creator.
(mx-author): Clear inherit, secret, hide-creator and dont-garb.
(mx-from): Ditto.
(mx-reply-to): Ditto.
(mx-message-id): Ditto.
(mx-in-reply-to): Ditto.
(mx-misc): Ditto.
(mx-allow-filter): Ditto.
(mx-reject-forward): Ditto.
(mx-to): Clear inherit and dont-garb.
(mx-cc): Ditto.
(canonical-name): Ditto.
(mx-date): Clear hide-creator, secret and dont-garb.
(notify-comments): Clear inherit, hide-creator and dont-garb.
(recommended-conf): Clear inherit and dont-garb.
(allowed-content-type): Clear inherit and dont-garb.  Require a
	priority number before the content type, and don't allow more
	than one "/" or " ".
(mx-list-name): Set owner-delete.  Clear dont-garb and inherit.
(mx-refuse-import): Set unique.  Clear dont-garb and inherit.
(mx-mime-misc): Set unique.
(mx-envelope-sender): Set unique.