"known failure" tests

[richcarl]

Idea: it should be possible to mark a test as "known failure" and report these separately, to handle test cases for known bugs not yet fixed (so you don't have to write a test case that checks that the bug is still present - tests should only be written to succeed for legal behaviour).

What about timeout/setup failures?

[marco-m]

This is a good idea indeed. Similar to the notion of skipping a test, that is not possible with eunit.