Issue #2435075 by dawehner: Implement admin role as a flag on the role storage, simplify permissions page, remove user_modules_installed
Issue #1975150 follow-up by David_Rothstein: Fix wrongly named return value in shortcut documentation.
Issue #1496534 by cosmicdreams, alexpott, aspilicious, kim.pepper, acrollet, dagmar, beejeebus, wizonesolutions | heyrocker: Convert account settings to configuration system.
Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.
- Patch #511286 by JacobSingh, David_Rothstein, dmitrig01, Gábor Hojtsy, ksenzee et al: add customizable shortcuts to the toolbar.