Section edit seems to clear all view caches

I think we don't have to clear all view cache like this.
Moreover expireAllViewCache is a static method.

```php

    static function expireAllViewCache()
    {
        eZExpiryHandler::registerShutdownFunction();
        $handler = eZExpiryHandler::instance();
        $handler->setTimestamp( 'content-view-cache', time() );
        $handler->store();
    }
```