Summary
- tuned;
- more operations: avoid intermediate list;
- discontinued somewhat pointless operation: Conjunction.intr_balanced / Conjunction.elim_balanced with single hyp performs better (e.g. see AFP/351b7b576892);
- update NEWS: Sortset and Termset turned out to be counter productive, Ord_List.union is much lighter;
- drop unused Set().ord, which is potentially inefficient due to dict_ord/dest;
- tuned;
- backout b6aa5eac0a1a;
- tuned;
- Thm.shared context: speed-up low-level inferences;
- tuned whitespace;
- backout 4a174bea55e2;
- Backed out changeset f34d11942ac1
- backout e3fe192fa4a8;
- backout 61f652dd955a;
- Backed out changeset e3db27e3b0c6
- Backed out changeset cd5d56abda10
- revert b43ee37926a9 due to problems with AFP/PAPP_Impossibility;