Changes

Summary

1. merged
2. tuned generation of TPTP with $ite/$let in higher-order logics
3. tuned generation of TPTP with $ite in function position
4. tuned TPTP generation of If helper facts
5. merged
6. clarified signature: prefer static operations;
7. clarified signature: avoid potential misunderstanding of Resources.empty as proper Resources;
8. more robust;
9. tuned signature;
10. clarified signature: more explicit class Entity_Context with private state + operations;
11. more hyperlinks, notably internal fact references;
12. Automated merge with bundle:/var/folders/9z/l1x9y3bd16x9_70pdp4703jr0000gp/T/SourceTreeTemp.14UUXO
13. A tiny bit of tidying connected with Zorn's Lemma