Collecting the following updates: - Improved the PoolCnv/SerCnv library creation to handle the case correctly when a converter gets removed as part of a CI job; - Added some new IDE improvements for Xcode/VisualStudio users; - Added a path to the FastJetContrib build to make it work more robustly on macOS. (See: https://fastjet.hepforge.org/trac/changeset/1092) - Added HDF5 as an external to AnalysisBaseExternals and AthAnalysisExternals; - Silenced a previous git error/fatal message showing up when the source directory would not be a git repository; - The installation of python modules with atlas_install_python_modules(...) now byte-compiles the modules during the build, testing them for syntax errors; - RelWithDebInfo builds now have the ability to produce two RPMs, one holding the non-debug payload (as before), and an additional one that only holds the debug symbol files; - Added pip to both AnalysisBaseExternals and AthAnalysisExternals, to allow analysers to download additional python modules for their analysis.