slightly clearer formulation

interpretation must always operate on the last element in a local theory stack, not on all elements: interpretated facts must disappear after pop from local theory stack, and transfer from last target is not enough

mark local theory as brittle also after interpretation inside locales; more correct bookkeeping on brittleness: must store directly beside lthy data, with implicit default true for levels > 1; check brittleness only during context switch using (in ...) syntax, not for arbitrary exit of local theory

merged

added isabelle_scala_script wrapper -- NB: portable hash-bang allows exactly one executable, without additional arguments;

tuned signature;

more informative Build.build_results; tuned;