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Tagging the following updates for 21.X:
  - Made the BAT build not rely on RooStats. To make it a bit easier to use against custom-built ROOT versions.
  - Updated the way status messages are printed while the `atlas_project` function reads in the configuration of all packages. To make the printouts in a partial build less overwhelming.
  - Updated the ROOT build to use its built-in GSL version.
  - Updated AthAnalysisExternals and AthSimulationExternals not to build code in a multi-threaded way.