Version of data root file used in the workspace

[tjavaid]

For the observed cross section, we have been using macro to further skim for passedFullSelection requirements on the observables and also renaming of mass4l and mass4lErr as “CMS_zz4l_mass” and “CMS_zz4l_massErr” respectively for workspace link1, link2.
To keep single version of skimmed data file be used for background templates and fraction and well as in the workspace, the workspace may be modified accordingly.