proper print mode for function_space notation (amending d68b705719ce);
isabelle update -u control_cartouches;
isabelle update -u mixfix_cartouches;
standardized towards new-style formal comments: isabelle update_comments;
session-qualified theory imports: isabelle imports -U -i -d '~~/src/Benchmarks' -a;
clarified main ZF.thy / ZFC.thy, and avoid name clash with global HOL/Main.thy; --HG-- rename : src/ZF/Main_ZF.thy => src/ZF/ZF.thy rename : src/ZF/Main_ZFC.thy => src/ZF/ZFC.thy rename : src/ZF/ZF.thy => src/ZF/ZF_Base.thy