[staticcontrollers] Raise Forbidden, not Unauthorized Unauthorized means "log in to get access", as it results in a HTTP 401. Here, the error is pretty much permanent, and returning 401 instead of 403 confuses things terribly. (This seems to be a pretty widespread confusion :/)

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raise NotImplementedError("Cannot migrate such an old version. Use intermediate Cubiweb version (try 3.16.x)")