Tag to be used with the master branch of atlas/athena. Update(s) since 2.0.91: - Modernised the CMake configuration files exported/installed by atlas_project(...); - Added Findnumpy.cmake and Findmatplotlib.cmake to AtlasLCG; - Fixed the (standalone) build of XRootD on macOS; - Added CLHEP and yampl to AthAnalysisExternals.