Changes from Mercurial (hg http://isabelle.in.tum.de/repos/isabelle/ default)
Summary
- merged
- more robust hybrid treatment of Pure, notably for Isabelle/Dedukti;
- clarified signature: name of standard_proof is authentic, otherwise empty;
- clarified expand_proof/expand_name: allow more detailed control via thm_header; export_standard_proofs: authentic theorem names in "print" format;
- option to export standardized proof terms (not scalable);
- more kinds, notably for Isabelle/MMT;