added Promise constructor, which is similar to Oracle but may be replaced later; added promise_proof; export min_proof, mk_min_proof; moved infer_derivs to thm.ML as derive_rule0/1/2; tuned oracles_of_proof; added is_named;
added Promise constructor, which is similar to Oracle but may be replaced later;
added promise_proof;
export min_proof, mk_min_proof;
moved infer_derivs to thm.ML as derive_rule0/1/2;
tuned oracles_of_proof;
added is_named;

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle