[development] Core module maintainers

[Karoly Negyesi]

> > Other suggestions? Or do we just wait for Europe to wake up?
> 
> Those lazy Europeans, always sleeping aren't they? ;)

For some time (let's hope not much) I am still European but I am not sleeping. Whether I am lazy is another topic :D

On the other hand, having two people around is a good idea but even better would be clearly outlining what does it entail to be a (co-)maintainer...