added padding to Mirabelle's output

merged

tuned generation of TPTP with $ite/$let in higher-order logics

tuned generation of TPTP with $ite in function position

tuned TPTP generation of If helper facts

merged

clarified signature: prefer static operations;

clarified signature: avoid potential misunderstanding of Resources.empty as proper Resources;

more robust;

tuned signature;

clarified signature: more explicit class Entity_Context with private state + operations;

more hyperlinks, notably internal fact references;

Automated merge with bundle:/var/folders/9z/l1x9y3bd16x9_70pdp4703jr0000gp/T/SourceTreeTemp.14UUXO

A tiny bit of tidying connected with Zorn's Lemma

tuned;

tuned;

proper handling of Protocol.Export, using the payload from the message --- in contrast db_context.read_export materializes only later by a different thread (race condition);

revert temporary workaround 6d111935299c;

added lemma

merged

tuned attributes to avoid looping

added eq_iff_swap for creating symmetric variants of thms; applied it in List.

tuned text;

more robust timeout, following df4449c6eff1;

more accurate Files.isRegularFile, exclude directories (e.g. jar_path);

proper java_version for isabelle_setup;

explicit option metric_argo_timeout, with reasonable default for Raspberry Pi;

tuned;