Add config option to enable/disable database or tradspool

Rocksolid_Light/rslight/rslight.inc.php

@@ -41,6 +41,7 @@ return [
   'nocem_groups' => 'rocksolid.spam',
   'expire_days' => '0',
   'pathhost' => 'unconfigured',
+  'article_database' => '1',
   'thissitekey' => '<site_key>'
 ];
 ?>

Rocksolid_Light/rslight/scripts/setuphelper.php

@@ -57,6 +57,7 @@ return [
 'nocem_groups' => 'The list of groups to monitor for nocem messages (space separated)',
 
 # Misc
+'article_database' => 'Enable storing articles in database files (1=database, blank=tradspool)',
 'expire_days' => 'Posts should be expired after how many days (zero for never)',
 'pathhost' => 'The pathhost to use in your XRef header. (maybe a one word name for your site)',
 'thissitekey' => 'An approximately 16 character random key (numbers, letters, else) specific for your site'