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...
Usually I keep them open for about 1 month and then we can close it. The "needs information" label and milestone is for that there. Allows to easy search for them later and close it then.