Sweeping !31315 from 21.6 to master. Fixes and minor updates to systematics and reweighting (!31433) · Merge requests · atlas / athena · GitLab

Atlas Nightlybuild requested to merge cherry-pick-cc58ef3f61-master into master Mar 24, 2020

Fixes and minor updates to systematics and reweighting

See merge request !31315 (merged)