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Introduce CSS_EVOLUTION_SCHEME=2,3 which are equivalent to 0,1 but take masses into account.

Frank Siegert requested to merge evolution-scheme-massive into master

As discussed in the dev meeting today, we would like to add options CSS_EVOLUTION_SCHEME=[2,3], both of which take masses into account for the evolution variable and are otherwise identical to CSS_EVOLUTION_SCHEME=[0,1].

This was discussed and implemented in the context of ttbb/ttjets and Vbb/Vjets with @johannes_krause and @shoeche. It would be good to include CSS_EVOLUTION_SCHEME=3 in the master benchmarking (@ebothmann, with setups added by @dnapoletano) to decide whether we want to make it the default, since it seems to perform best for V+HF compared to data.

@shoeche mentioned that Dire has an evolution variable which takes this into account already, so it should be fine to do this only for CSS/MCATNLO and still be able to compare to Dire.

Edited by Frank Siegert

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