Fix VM3 and php warnings

buyer_assign_group.php

@@ -62,8 +62,8 @@ class plgVmCustomBuyer_Assign_Group extends vmCustomPlugin {
 	 * We must reimplement this triggers for joomla 1.7
 	 * vmplugin triggers note by Max Milbers
 	 */
-	public function plgVmOnStoreInstallPluginTable($psType) {
-		return $this->onStoreInstallPluginTable($psType);
+	public function plgVmOnStoreInstallPluginTable($psType, $name) {
+		return $this->onStoreInstallPluginTable($psType, $name);
 	}
 
 	// VM2 Compat:

buyer_assign_group.script.php

@@ -46,7 +46,7 @@ class plgVmCustomBuyer_Assign_GroupInstallerScript
     public function install(JAdapterInstance $adapter)
     {
         // enabling plugin
-        $db =& JFactory::getDBO();
+        $db = JFactory::getDBO();
         $db->setQuery('update #__extensions set enabled = 1 where type = "plugin" and element = "buyer_assign_group" and folder = "vmcustom"');
         $db->query();