Summary
- merged
- lemmas about sets and the enumerate operator
- yet another little lemma
- merged
- merged
- merged
- strengthened a lemma
- A new lemma about abstract Sum / Prod
- separation of reversed bit lists from other material
- merged
- avoid exhaustion of worker threads, notably due to complex interaction of future/promise/lazy in Proofterm.make_thm_node;
- more robust: insist in finished future;
- unused;
- further refinement of code equations for mask operation