Merge pull request #2309 from Nicofuma/ticket/11366

[ticket/11366] Extension's version's check

* Nicofuma/ticket/11366: (29 commits)
  [ticket/11366] Fix headings css in list page
  [ticket/11366] Add config value in schema_data.sql
  [ticket/11366] Fix HTML
  [ticket/11366] Exchange links and settings' form
  [ticket/11366] Remove the extra {S_FORM_TOKEN}
  [ticket/11366] Move the links to the top of the page
  [ticket/11366] Hide the version check settings by default
  [ticket/11366] Versions, options and actions heading should be centered
  [ticket/11366] Better language string for "recheck all"
  [ticket/11366] Move "recheck all" link
  [ticket/11366] Add $config['extension_force_unstable']
  [ticket/11366] Use force_cache on the list page
  [ticket/11366] Add recheck-all link
  [ticket/11366] Force the use of the cache on the list page
  [ticket/11366] Update FILE_NOT_FOUND language string
  [ticket/11366] Fix whitespaces
  [ticket/11366] Update FILE_NOT_FOUND language string
  [ticket/11366] Update var names
  [ticket/11366] Align language strings
  [ticket/11366] Fix detailed view
  ...

phpBB/phpbb/db/migration/data/v310/extensions_version_check_force_unstable.php

@@ -0,0 +1,25 @@
+<?php
+/**
+*
+* @package migration
+* @copyright (c) 2012 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+namespace phpbb\db\migration\data\v310;
+
+class extensions_version_check_force_unstable extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array('\phpbb\db\migration\data\v310\dev');
+	}
+
+	public function update_data()
+	{
+		return array(
+			array('config.add', array('extension_force_unstable', false)),
+		);
+	}
+}