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more tracing;

Theory.checkpoint for main operations, admits concurrent proofs;

promise: include check into future body, i.e. joined results are always valid;
pending future derivations: shared ref within whole theory body, i.e. end-of-theory joins *all* derivations ever forked from a version of the theory;
simplified rep_deriv;

proper transfer of theorems that involve classes being instantiated here;

HOL_USEDIR_OPTIONS no longer applies to HOL-Plain (main HOL is rebuilt from Pure);

eliminated polymorphic equality;

added subset operation;

Added fresh_star_const.

Added some more theorems to NominalData.

Added some more lemmas that are useful in proof of strong induction rule.