Deprecating old "upgrade" files. MDL-7214

Merged from MOODLE_17_STABLE

mod/data/db/postgres7.php

@@ -1,5 +1,10 @@
 <?php
 
+// THIS FILE IS DEPRECATED!  PLEASE DO NOT MAKE CHANGES TO IT!
+//
+// IT IS USED ONLY FOR UPGRADES FROM BEFORE MOODLE 1.7, ALL 
+// LATER CHANGES SHOULD USE upgrade.php IN THIS DIRECTORY.
+
 function data_upgrade($oldversion) {
 /// This function does anything necessary to upgrade
 /// older versions to match current functionality
@@ -265,7 +270,9 @@ function data_upgrade($oldversion) {
         execute_sql("ALTER TABLE {$CFG->prefix}data_content ALTER COLUMN content4 DROP NOT NULL");
         execute_sql("ALTER TABLE {$CFG->prefix}data_content ALTER COLUMN content4 DROP DEFAULT");
     }
-    
+
+    //////  DO NOT ADD NEW THINGS HERE!!  USE upgrade.php and the lib/ddllib.php functions.
+
     return true;
 }