Allow skipping passing tests

[christiangnrd]

Add a test flag that skips tests in the history not in the failures. This amounts to running only new and failing tests when the argument is present.

I'm picturing this being useful when running the testsuite and iterating locally.

@giordano if you think this is useful I'll add documentation

[giordano]

This sounds interesting, but I imagine this is more useful during some debugging cycles, not for "production". Maybe let's not document it for the time being, also not to encourage users too much, especially if this currently interacts badly with other features (#208)

[christiangnrd]

I imagine this is more useful during some debugging cycles, not for "production"

Yes exactly!

Maybe let's not document it for the time being, also not to encourage users too much, especially if this currently interacts badly with other features (#208)

That works for me. I just suggested a comment and we leave undocumented and this seems ready