Summary
- proper check_file operation via File.space (amending 6ad3a412ed97 --- broken in Isabelle2023);
- clarified signature;
- clarified modules;
- clarified signature: more operations;
- tuned comments;
- more NEWS;
- more TODO;
- prefer strict test of system options;
- some build cluster resources at TUM;
- build cluster host specifications are based on registry entries (table prefix "host");
- more robust init;
- clarified signature: more operations;
- support interpreted/typed entries via Registry.Category and Registry.Table;
- clarified signature: more operations;
- clarified output;
- support for global registry;
- clarified loading of symbols: permissive entries in $ISABELLE_SYMBOLS require explicit "?";