Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.39:
  - Re-introduced the creation of a packages.txt file for each ATLAS project;
  - Introduced a test in atlas_install_headers(...) for the existence of the specified directory;
  - Added improvements/fixes to FindNjet.cmake, FindOpenLoops.cmake and FindSuperchic.cmake;
  - Upgraded to Acts v0.10.04.

Tag to be used with the 21.X branches of atlas/athena.
Updates in this tag:
  - Updated the standalone MCUtils build to version 1.3.3;
  - Updated FindSuperchic.cmake to find/use version >=3.05 correctly;
  - Fixed some issues in FindNjet.cmake and FindOpenLoops.cmake.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.38:
  - Updates to CheckerGccPlugins;
  - Reverted the symbol hiding of component libraries that was introduced in 2.0.38;
  - Introduced a different mechanism for preventing linking against component libraries, one putting statements into the compilation/link commands that would make those fail;
  - Hid the "Package build suceeded" messages when per-package log file writing is disabled.

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.

Tag to be used with the 21.X branches of atlas/athena.
Updates in this tag:
  - Made FastJet(Contrib) compile correctly in C++14/17 mode;
  - Upgraded to building LHAPDF 6.2.1;
  - Added FindHepMC3.cmake to AtlasLCG.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.36:
  - Updated the standalone build of Python, Boost and FastJet(Contrib) to happen correctly in C++14/17 mode;
  - Added Findhepmc3.cmake, FindNjet.cmake and FindOpenLoops.cmake to AtlasLCG.

Tag to be used with the 21.X branches of atlas/athena.
Updates in this tag:
  - Fixed the standalone build of Boost (in C++17 mode) on macOS with Clang;
  - Added FindTIFF.cmake, FindNjet.cmake and FindOpenLoops.cmake to AtlasLCG.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.35:
  - Added the ability to run checks on the (installed) python files of packages;
  - Added FindTIFF.cmake to AtlasLCG.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.34:
  - Updated to Acts v0.10.1;
  - Small update in Findmccabe.cmake to make it more future proof;
  - Multiple updates from 1.0.X that were necessary for AnalysisBaseExternals and AthAnalysisExternals with GCC 8 on CentOS 7.

Tag to be used with the 21.X branches of atlas/athena.
Updates in this tag:
  - Taught AnalysisBaseExternals not to pick up python from /bin by default;
  - Taught AtlasLCG not to consider /bin and /lib when locally installed packages should not be used.

Tag to be used with the 21.X branches of atlas/athena.
Updates in this tag:
  - Updated AtlasLCG and AtlasCMake to use C++17 for GCC >=7;
  - Updated XRootD, KLFitter and BAT to build successfully with GCC 8 in C++17 mode;
  - Turned off the build of CheckerGccPlugins with GCC >=7;
  - Fixed a mistake in the CLHEP build that caused a build error with new CMake versions;
  - Updated FindGaudi.cmake to behave just a little bit better than it did before.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.33:
  - Further dependency fixes for the PyModules package, adding mccabe and backports as explicit dependencies for it.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.32:
  - Added a find-module for the functools32 python module/package;
  - Extended PyModules to explicitly declare all the python modules that it depends on from LCG.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.31:
  - Added PyModules and flake8_atlas to the AthSimulationExternals project.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.30:
  - Updated the PyModules package to use pip for installing flake8;
  - Introduced the flake8_atlas package;
  - Added a find-module for the futures python package;
  - Made a number of updates in AnalysisBaseExternals to make it build with GCC 8 in C++17 mode.

Tag to be used with the 21.X branches of atlas/athena.
Updates in this tag:
  - Updated KLFitter to version 1.3.2;
  - Added the correct LHAPATH from CVMFS to the environment;
  - Added extra find-modules for setting up python packages from LCG_95;
  - Updated lwtnn to version 2.9.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.29:
  - Fixed the dependency setup of the CINT dictionary generation to watch for changes in the used header files.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.28:
  - Added the PyModules package to build python modules needed by the Athena project;
  - Updated KLFitter to version 1.3.2;
  - Various updates to CheckerGccPlugins;
  - Updated Acts to version 0.9.2;
  - Added find-modules for pandas and sqlalchemy in AtlasLCG.

Tag to be used with the 21.X branches of atlas/athena.
Updates in this tag:
  - Backported the CMake 3.13 updates from the master branch;
  - Backported AtlasLCG changes necessary for LCG_95;
  - Updated lwtnn to version 2.8.1;
  - Taught AtlasCMake to remove stale .pyc files in incremental builds;
  - Updated AnalysisBaseExternals and AthAnalysisExternals to use LCG_95.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.27:
  - A *lot* of updates in AtlasCMake. Tried to clean up the code in a lot of different ways;
  - Updated all LCG based projects to use LCG_95 by default;
  - Updated all "standalone externals" to be in sync with their LCG_95 versions.