Tag to be used with the master branch of atlas/athena. Update(s) since 2.0.37: - Fixed the setup/usage of $TDAQ_RELEASE_BASE in Findtdaq.cmake and Findtdaq-common.cmake; - Updated the standalone builds to LHAPDF 6.2.1; - Updated the standalone builds to MCUtils 1.3.3; - Added a flake8 checker for ATLAS copyright statements in Python files; - Made each CMake (re-)configuration delete the project's main .rootmap file; - Made all symbols in component libraries hidden, to prevent clients from linking against them.