Parallelize CemaNeige
Similarly to #96, the computation done on several altitude bands of CemaNeige could be parallelized. This remark is potentially valid both for RunModel_CemaNeige* calculation but also for DataAltiExtrapolation_Valery.
Similarly to #96, the computation done on several altitude bands of CemaNeige could be parallelized. This remark is potentially valid both for RunModel_CemaNeige* calculation but also for DataAltiExtrapolation_Valery.