Added infrastructure for embedding random data generators into code generated for inductive predicates.

unused_thms: show only results from 'theorem(s)' package (via old-style kinds); misc tuning -- slightly less hermetic names;

future_result: purge flexflex pairs, which should normally be trivial anyway -- prevent Thm.future_result from complaining about tpairs;

toplevel pretty printer for Synchronized.var;

adapted Local_Theory.define -- eliminated odd thm kind;

Specification.definition: Thm.definitionK marks exactly the high-level end-user result;

Local_Theory.define: eliminated slightly odd kind argument -- such low-level definitions should be hardly ever exposed to end-users anyway;

merged

merged

Minor correction