Normalise grids properly

[cschwan]

Two-dimensional distributions are not supported by mg5_aMC, and therefore we linearise the 2D distributions to 1D, but after the grid generation we have to undo the linearisation using pineappl remap ... in a postrun.sh script to properly normalise them. The following analyses are affected by this:

• ATLAS_DY3D_8TEV, fixed in commit 739ab7f, but needs implementation in PineAPPL
• CMSDY2D11, fixed in commit 8e38d71
• Add CMSDY2D12 dataset #43: CMSDY2D12
• Add ATLAS_DY2D_8TEV dataset #44: ATLAS_DY2D_8TEV
• Add CMS_2JET_7TEV dataset #67: CMS_2JET_7TEV, fixed in commit be0afb7
• Add ATLAS_2JET_7TEV_R06 dataset #69: ATLAS_2JET_7TEV_R06, fixed in commits be0afb7 and 883f58e
• Add CMS_2JET_3D_8TEV dataset #70: CMS_2JET_3D_8TEV, fixed in commit be0afb7, but needs implementation in PineAPPL
• Add ATLAS_1JET_8TEV_R06 dataset #71: ATLAS_1JET_8TEV_R06, fixed in commit 0cca8ba

[cschwan]

This requires support in PineAPPL, see NNPDF/pineappl#59.