Summary
- merged
- tuned signature, for the sake of AFP/Isabelle_C;
- more uniform report of Markup.language_path;
- omit pointless guard: ultimately observed by Isabelle_Process.report_message;
- tuned signature;
- clarified modules;
- tuned;
- tuned signature;
- tuned;
- tuned;
- tuned output;
- merged
- Tidied some messy proofs