- Renamed parameter "merge_feature" to "personalization_feature"

Limit personalization: Only when posted from WWSympa, entire text will be converted. Otherwise only footer/header will be converted.

MySQL: With MySQL 5.6, 5.7.6 and later sql_mode system variable contains STRICT_TRANS_TABLES by which some obsoleted columns such as date_admin causes "(42000) Invalid default value" error.  Fixed by resetting sql_mode to be empty, the default on 5.5.x or earlier.

As of Postfix 2.3, Content of Return-Path: pseudo-header field added by pipe(8) for null envelope sender became "MAILER-DAEMON".  Empty `null_sender` option will prevent this behavior.
As a workaround, the uppercase "<MAILER-DAEMON>" will be treated as null envelope sender.

This allows you to invoke the command from "sendmail_aliases" without using the wrapper (#946).

<sympa-request> address should not be forwarded to any functions of Sympa.  To avoid mail loop by such misconfiguration, discard messages bound for this address.

There is no save method in Sympa::List anymore.

* 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

* Merge @Sympa::ConfDef::params into %Sympa::ListDef::pinfo
* Merge %Conf::old_params into %Sympa::ListDef::pinfo
* Add aliases of parameter names for compatibility to sympa.conf/robot.conf of earlier versions.
* Move content of Sympa::ListDef to Sympa::Config::Schema
* Move content of Sympa::ConfDef to Sympa::Config::Schema
* Defining additional format entries in config schema.
* Merge sympa.conf(5) and list_config(5) into sympa_config(5).

This bug was injected at 6.2.49b.2 (9b562c6b).

A module couldn't compile without optional dependency.

Revert "Every time users were loaded via include8sql_query Sympa would raise warnings : Use of uninitialized value  in printf at /usr/local/sympa/bin/Sympa/DataSource/SQL.pm line 91. Obviously the issue was introduced back in 2015, as mentionned in https://listes.renater.fr/sympa/arc/sympa-users/2015-12/msg00002.html."

This reverts commit 067e92a1.

Every time users were loaded via include8sql_query Sympa would raise warnings : Use of uninitialized value  in printf at /usr/local/sympa/bin/Sympa/DataSource/SQL.pm line 91. Obviously the issue was introduced back in 2015, as mentionned in https://listes.renater.fr/sympa/arc/sympa-users/2015-12/msg00002.html.

Fix: List::load() does call check_param_constraint(). This is not required; check_param_constraint() only make sense when a family list gets re/instantiated. These calls are very expensive for institutions heavily using families. Our production list service has 2.500 lists; most of them belonging to a family. In these circumstances wwsympa.fcgi startup takes 3 minutes. Applying this patch lowers wwsympa.fcgi to 35 seconds. Much better. I did some tests to ensure this patch does not prevent param_constraint checking while instantiating, modifying, adding lists to families. My tests (based on Test::BDD::Cucumber) are public on https://github.com/salaun-urennes1/sympa-functional-tests

Instead, the new wwsympa_url_local parameter may be used to specify upstream URL.