unfinished should allow no limits with the following behaviour
remove finishing restriction when not using limits
ffa results now uses a more groupstage like positioning (better for unfinished tournaments - and doesnt pretend to know more than it really does
make position counting universal, sensible, and simple
fix pos computation special case crash (winner limit !== adv)
tests now back to verifying ties beyong winner level (but refactored a bit)
implement .against on results and sort on score difference now
fix rawPositions for TieBreaker
more specific tests