Re-implementation of some of the ATLAS Collider DY Datasets

Created by: Radonirinaunimi

The following PR implements some of the ATLAS collider DY in the new commondata format. The status is summarized in the table below.

☑️ in Comparison vs. Old means that the results are fully identical while 🔴 means that comparisons are available but noticeable differences are perceived.

Dataset Name	Comparison vs. Old	General Comments	Status
ATLAS_DY_7TEV_EMUON_Y	☑️	The old implementation used a luminosity uncertainty of 3.5% while in HepData it is 3.4%	☑️
ATLAS_DY_7TEV_DILEPTON_Y-CRAP	☑️	The new implementation (from HepData) is missing one source of uncorrelated systematics	☑️
ATLAS_DY_7TEV_DILEPTON_Y-FRAP	☑️	The new implementation (from HepData) is missing one source of uncorrelated systematics	☑️
ATLAS_WPWM_8TEV_MUON_Y		FK tables are missing but old commondata exists	☑️
ATLAS_Z0_8TEV_LOWMASS_2D	☑️		☑️
ATLAS_Z0_8TEV_HIGHMASS_2D	🔴	Slight differences in treatment of asymmetric systematic correlated uncertainties	☑️
ATLAS_Z0_8TEV_3D_CRAP		Could not find dataset and FK tables to compare the implementation to	☑️
ATLAS_Z0_8TEV_3D_FRAP		Could not find dataset and FK tables to compare the implementation to	☑️
ATLAS_DY_13TEV_FID	☑️	Just needs to fix the plotting to be as a function of Gauge bosons	☑️
ATLAS_Z0_8TEV_20FB_PT-INVDIST			☑️
ATLAS_Z0_8TEV_20FB_PT-RAPDIST			☑️

Remains TODO:

• Define the plotting entries to be exactly the same as before