add upgrade facilities to facilitate version upgrades

ui/nG6/pi1/class.tx_nG6_pi1.php

@@ -95,6 +95,8 @@ class tx_nG6_pi1 extends tslib_pibase {
 			<link type="text/css" rel="stylesheet" media="screen" href="'.t3lib_extMgm::siteRelPath($this->extKey).'res/css/jquery.ui.dialog.css"/>
 			<link type="text/css" rel="stylesheet" media="screen" href="'.t3lib_extMgm::siteRelPath($this->extKey).'res/css/jquery.ui.resizable.css"/>';
 
+		tx_nG6_db::check_db_rights_level();
+
 		// if asked to upgrade to version 1.3
 		if($this->piVars['upgrade']){
 			$content = tx_nG6_upgrade::upgrade($this->piVars['upgrade']);