Support multiple update streams

This patch allows the upgrader to upgrade multiple database update
'streams'. The main stream is renamed to 'core' to reflect changes made
to the config class. This will significantly ease customizations
requiring database customizations, and will make plugins requiring
database changes possible.

main.inc.php

@@ -70,13 +70,11 @@
     define('SETUP_DIR',INCLUDE_DIR.'setup/');
 
     define('UPGRADE_DIR', INCLUDE_DIR.'upgrader/');
-    define('SQL_DIR', UPGRADE_DIR.'sql/');
 
     /*############## Do NOT monkey with anything else beyond this point UNLESS you really know what you are doing ##############*/
 
     #Current version && schema signature (Changes from version to version)
     define('THIS_VERSION','1.7.0+'); //Shown on admin panel
-    define('SCHEMA_SIGNATURE', '740428f9986da6ad85f88ec841b57bfe'); //MD5 signature of the db schema. (used to trigger upgrades)
     #load config info
     $configfile='';
     if(file_exists(ROOT_DIR.'ostconfig.php')) //Old installs prior to v 1.6 RC5

scp/upgrade.php

@@ -17,7 +17,7 @@ require_once 'admin.inc.php';
 require_once INCLUDE_DIR.'class.upgrader.php';
 
 //$_SESSION['ost_upgrader']=null;
-$upgrader = new Upgrader($cfg->getSchemaSignature(), TABLE_PREFIX, SQL_DIR);
+$upgrader = new Upgrader(TABLE_PREFIX, UPGRADE_DIR.'streams/');
 $errors=array();
 if($_POST && $_POST['s'] && !$upgrader->isAborted()) {
     switch(strtolower($_POST['s'])) {