Activate selction controls for the `my documents` Tab.

With the integration of `ftw.zipexport` there also tabbedview actions available in the `My documents` tab. So it make sense to activate the selection controls (Alle/Keine).

![bildschirmfoto 2013-11-24 um 22 58 56](https://f.cloud.github.com/assets/485755/1609684/a78c9a08-5553-11e3-9c5b-2923d26d5312.png)