Manually apply PR #1594 (fixing phpdoc page-level generation/warnings)
Also partially fixes issue #1295, fixes inconsistencies in some page-level docblocks and adds include checks in language files.
diff --git a/system/libraries/Migration.php b/system/libraries/Migration.php
index 5d637d4..06f2f56 100644
--- a/system/libraries/Migration.php
+++ b/system/libraries/Migration.php
@@ -1,4 +1,4 @@
-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php
/**
* CodeIgniter
*
@@ -24,6 +24,7 @@
* @since Version 3.0
* @filesource
*/
+defined('BASEPATH') OR exit('No direct script access allowed');
/**
* Migration Class