I-Al-Istannen bf8b3cf9f7 Hack in support for TI exams
This just adds an additional crawl check for AlteKlausuren. This is not
present on the root site but at the suffix `/Klausuren`.
Example config:

```py
 # The "Klausur" needs to be copied verbatim!
ti.synchronize("Klausur", "sync dir name",
               transform=ro_19_klausur_transform, filter=ro_19_klausur_filter)
```
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