first, rough version

@carlaschroder lots to do still - I'd like feedback especially from Jennifer, but also @dragotin @karlitschek @danimo @LukasReschke @PVince81 and others ;-)

Mostly on the gaps and the questions in there...
Nowadays we don't set them anymore. But they would *REALLY* help. We now have about 700 open issues and some of them are very harmless while others can lead to data destruction :-(

We should at least have some labels like "potential data destruction", and "minor issue". Obviously they should better named than my proposals here ;-)