Feature: Fail all tests which are impossible to order correctly

[victor-nexthop]

While working on #242, I thought about ways to signal that tests have ordering that is impossible to satisfy.

The annotations wrap the test functions; can we FAIL the mis-ordered tests?

[mrbean-bremen]

Do you mean something like this option?

[victor-nexthop]

Oh my, yes. Interestingly, I have it already set, but it didn't always fail for me. Let me come back if I find an issue with it, but for now let's just assume that I missed something.