DIS: IC FONLL-A Scale variations

[felixhekhorn]

• We believe that the order of the calls to IncludeScaleVariation and IncludeIntrinsicCharm has to be switched here:
  

  apfel/src/DIS/initIntegralsDIS.f

  Lines 52 to 60 in fdfd068

  	*
  	* Include intrinsic charm contributions
  	*
  	if(IntrinsicCharm) call IncludeIntrinsicCharm
  	*
  	* Scale variations
  	* (only if the dynamical scale variation is disabled)
  	*
  	if(.not.DynScVar) call IncludeScaleVariation

• otherwise the assignment here
  

  apfel/src/DIS/IncludeIntrinsicCharm.f

  Lines 293 to 295 in fdfd068

  	* Neutral Current
  	SC2m0NC(igrid,ixi,3,1,beta,alpha) =
  	1 SC2zm(igrid,Nf_FF,3,1,beta,alpha)

  
  comes too early and misses the scale variations of the light coefficient functions that are however needed to cancel the scale variation from the intrinsic counter part - compare also Appendix B of https://inspirehep.net/literature/1397009