Add the possibility of evolving the fit with hoppet#2485
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This PR implements the evolution of the PDF using HOPPET with the
--hoppetflag.The generation of the xgrid, qgrid, etc, is the same as with the vanilla evolution and the results are, at NNLO, equivalent for Q > mc.
For Q < mc the way HOPPET and EKO invert the threshold is different, see:
EKO: https://eko.readthedocs.io/en/latest/theory/Matching.html#backward-evolution
HOPPET: https://github.com/hoppet-code/hoppet/blob/31a2ff92aa82f227505ee0ce111db8acfce340a0/src/evolution.f90#L329
We would need to set
inversion_method = expandedand the mass of the charm to 0 to get the exact same results with both.N3LO to be tested.