moify libexec/error to forward mail which smtp sender is fml_owner().

so remove later object creation.

[*_program -> *_function]

$use_command_mail_program   -> $use_command_mail_function
$use_digest_program         -> $use_article_digest_function
$use_distribute_program	    -> $use_article_post_function
$use_error_analyzer_program -> $use_error_mail_analyzer_function

[command list]

$commands_for_user            -> $user_command_mail_allowed_commands
$commands_for_stranger        -> $anonymous_command_mail_allowed_commands
$commands_for_privileged_user -> $admin_command_mail_allowed_commands
$commands_for_admin_cgi	      -> $admin_cgi_allowed_commands

[restrictions]

$post_restrictions -> $article_post_restrictions
$post_restrictions_reject_notice_data_type
-> $article_post_restrictions_reject_notice_data_type

$command_restrictions -> $command_mail_restrictions
permit_commands_for_stranger -> permit_anonymous_command_mail

$admin_command_restrictions -> $admin_command_mail_restrictions

$curproc->load_config_files($cf_list);
   ->
$curproc->load_config_files();

$curproc->load_config_files( $args->{ cf_list } );
  =>
$curproc->resolve_ml_specific_variables();
my $cf_list = $curproc->get_config_files_list();
$curproc->load_config_files($cf_list);

$curproc->parse_incoming_message($args);
  =>
$curproc->parse_incoming_message();

It is a top level parameter FML::Process::Switch provides. Almost
functions should access the content via utility methods provided by
FML::Process::Utils.

modify FML::Process::* to use it.

FML::Process::Kernel supports customization by $computer_output_engine
definition.

$curproc->log_message_init() is called within prepare() method of each
program.