Issue #2390749 by alexpott: run-tests.sh should allow single test methods to be run
Issue #2387149 by Gábor Hojtsy, dawehner: Display extenders are not possible to describe with config schema
Issue #2389697 by Wim Leers, Gábor Hojtsy: Editor settings altering not needed (and not compatible with config schema assumptions)
Issue #2390445 by Gábor Hojtsy: System module tests don't pass config schema check