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reverted to rel behaviour for the evaluation of PDF in the shower.

davide napoletano requested to merge css-fixes-wrt-rel2 into master

In particular this commit uses the CMW scale for the evaluation of PDF as well as alphaS in the shower, implicitly raising the shower cutoff. This fixed the soft-enhancement behaviour seen in comparisons to release.

NOTE: this would need to be complemented with tuning and possibly the re-introduction of KPERP in the remnants.

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