adding list of files that are included by include/validate.php

helps to minimize require_once and include_once statements.

doc/plugin.txt

@@ -151,6 +151,43 @@ see other plugins that directly include other SquirrelMail files, but
 that is no longer necessary and is a hold-over from older SquirrelMail 
 versions.
 
+List of files, that are included by include/validate.php (If SquirrelMail
+version is not listed, files are included from v.1.3.2.):
+   1. class/mime.class.php
+      1.1. class/mime/Rfc822Header.class.php
+      1.2. class/mime/MessageHeader.class.php
+      1.3. class/mime/AddressStructure.class.php
+      1.4. class/mime/Message.class.php
+      1.5. class/mime/SMimeMessage.class.php
+      1.6. class/mime/Disposition.class.php
+      1.7. class/mime/Language.class.php
+      1.8. class/mime/ContentType.class.php
+   2. functions/global.php
+   3. functions/strings.php
+   4. config/config.php
+      4.1. config/config_local.php (from 1.4.0rc1)
+   5. functions/i18n.php
+      5.1. functions/global.php (from 1.4.0)
+   6. functions/auth.php
+   7. include/load_prefs.php
+      7.1. include/validate.php
+      7.2. functions/prefs.php
+      7.3. functions/plugin.php
+         7.3.1. functions/global.php (from 1.4.0 and 1.5.0)
+         7.3.2. functions/prefs.php (from 1.5.1)
+      7.4. functions/constants.php
+      7.5. do_hook('loading_prefs')
+   8. functions/page_header.php
+      8.1. functions/strings.php
+      8.2. functions/html.php
+      8.3. functions/imap_mailbox.php
+         8.3.1. functions/imap_utf7_local.php
+      8.4. functions/global.php
+   9. functions/prefs.php
+      9.1. functions/global.php
+      9.2. $prefs_backend (from 1.4.3rc1 and 1.5.0)
+           functions/db_prefs.php
+           functions/file_prefs.php
 
 Hook Types:  Parameters and Return Values
 -----------------------------------------