Release criterion proposal: upgrade methods

[Kamil Paral]

> I actually think it's fine, now I finally got my head around
> that - if you forget all the troubles we had with the rewrite, and
> forget the rest of my mail, and just read the final proposal I came
> up
> with, is it actually very difficult to understand?

No, it is not that difficult. I was speaking more generically, because we hit "all/any" issues very often with different criteria. The idea was not tied to this particular one.