[Pharo-project] [update 1.1] #11111

11111 ----- Issue 1646: SLICE-PreferencesReferencesRemovalPart2 * remove all remaining Preferences references * also fix a DiffMorph bug introduced by previous SLICE-PreferencesReferencesRemovalPart1 (send of #setting instead of #settings) Thanks, Alain! Issue 1649: Workspace cannot print object whose class does not inherit from Behavior Thanks to Adrian Kuhn