Twig new

During the last two days I implemented a few improvments:

• Doku
• first Base-Templates
• add stores to context
• Bug: 10.twig = must start with single quote only
• Bug: vars passed to twig are not availabel TS afterwards

Unittests would still be nice to have, but I think it's better to integrate this now and improve later then to wait any longer.

extension/Classes/Core/Database/Database.php

@@ -971,8 +971,8 @@ class Database {
         $executed = $this->mysqli->multi_query($sqlStatements);
         if (false === $executed) {
             $errorMsg[ERROR_MESSAGE_TO_USER] = 'SQL Error.';
-            $errorMsg[ERROR_MESSAGE_TO_DEVELOPER] = "Error playing multi query: " . $sqlStatements;
-            throw new \CodeException($errorMsg, ERROR_PLAY_SQL_MULTIQUERY);
+            $errorMsg[ERROR_MESSAGE_TO_DEVELOPER] = "Error playing multi query:" . $this->mysqli->error . "\n\nSQL Query:\n\n" . $sqlStatements;
+            throw new \CodeException(json_encode($errorMsg), ERROR_PLAY_SQL_MULTIQUERY);
         }
 
         // discard all results: this is important - if missed, following calls on $mysqli will fail.