Relative to #993: with this option, we can rebuild all archives with a
simple `for` bash loop, without restarting from beginning if
`archived.pl` restarts while rebuilding all lists.

* review: Won't process sync_include in advance so that processing will be faster.

* Refactoring. Sympa::List::on_the_fly_sync_include() was removed. Instead, "include" request handler had "delay" option.

* Remove unused "last_sync" cache entries.  "last_change" entries remain.

* sync_include will no longer be invoked during Sympa::List->new():
  - No owner defined in a list is no longer treated as error_config.
  - Instead, if no owner defined,
     - If possible, discard incoming message and send back DSN to original sender,
     - or, notifications to owners will be redirected to listmaster(s).

* Refactoring: Remove unused functions

* Small refactoring: mail_tt2/listeditor_notification.tt2 is no longer used.

* Clarify log messages and DSN about undefined owner/editor/listmaster

Fix : sympa.pl --instantiate_family did not return errors if there was only one. Also did return status 0 wen we encoutered errors

A note:
Now create_list, create_automatic_list & update_automatic_list Request handlers won't take "listname" as an top-level parameter, but it must be included in an item of "parameters" parameter.

Fix errors 'Can't use an undefined value as an ARRAY reference' while running sympa.pl --modify_list. Check if  and  before trying to print their content

- Small change to --open_list to let it handle pending lists
- Add --show_pending_lists=robot option to print pending lists (with some
  informations)

Fix #637

I forget the type of the parameter

Options for sympa.pl are also renamed to --dump_users and --restore_users.

  - `--dump` dumps list members/owners/editors to file under list directory.
  - `--suck` restores list members/owners/editor from this file.

They dump or restore list users (members, owners or editors) in database from/to file.

[change] File for members was changed to `<list dir>/member.dump` which will replace:
  - `subscribers` (used by Sympa prior to 5.4a.1)
  - `subscribers.db.dump` (generated by dump command)
  - `subscribers.closed.dump` (backup for closed list)
[change] Additional files to dump owner or editor: `<list dir>/owner.dump`, `<list dir>/editor.dump`.
They will be used as initial (permanent) owners/editors, or as backup for closed list
[*change] owner and editor parameters in list config file are no longer sync with actual owners/editors.  They are used only at the time of installation of list.

  - description (info) parameter is not mandatory.
  - the "moderator" parameter in documentation has never been implemented: "editor" would be used.
  - "topic" was implemented as documentation describes, not "topics", but some of code uses "topics".

Fixed, with implementing "moderator" as synonym of "editor", but without multipe attribute.