Let each numerator have its own denominator

[sumiya11]

May be useful for Gleb.
I did not see a speedup because I could not find models where GB is a bottleneck.
Do not merge.

--Sasha

[pogudingleb]

Thanks, Sasha !
As discussed elsewhere, we can take this idea further and have the same number of numerators and denominators. This would at least simplify the MQS logic. Just pushed this update