more scalable collections of tasks, notably for totality of known group members; tuned;

tuned signature; tuned;

merged

prefer p2e before e2p; use measure_unique_Int_stable_vimage;

add auto support for AE_mp

add borel_fubini_integrable; remove unused bijectivity rules for measureable functions

parallelization of nested Isar proofs is subject to Goal.parallel_proofs_threshold;

Task_Queue.update_timing: more precise treatment of interruptibility; Task_Queue.waiting: potentially expensive wait dependencies are subject to trace flag;

Lazy.force_result: more standard treatment of interruptibility, potentially addressing races of exceptions vs. interrupts;

thm_proof: visible fulfill_body only, without joining nested thms -- retain proof irrelevance, which is important for parallel performance;

tuned comments;

clarified Proofterm.proofs_enabled;

explicit is better than implicit;

tuned odd conditional expression;