Report transaction failures to CiviCRM debug log as well as civicrm_system_log.

Refs #28

Author: xurizaemon

CRM/Core/Payment/PaymentExtended.php

@@ -275,6 +275,7 @@ protected function handleError($level, $message, $context, $errorCode = 9001, $u
     // Reset gateway to NULL so don't cache it. The size of the object or closures within it could
     // cause problems when serializing & saving.
     $this->gateway = NULL;
+    Civi::log()->log($level, $message, $context);
     $log = new CRM_Utils_SystemLogger();
     $log->log($level, $message, (array) $context);
     throw new \Civi\Payment\Exception\PaymentProcessorException($userMessage);