renamed kill_all to kill, in conformance with atp_kill command;
simplified/unified treatment of preferences;
check_thread_manager: CRITICAL due to global ref;
goal addressing via Thm.cprem_of;
reduced NJ basis library stuff to bare minimum;
\input{base.tex}
\input{prelim.tex}
\input{logic.tex}
\input{tactic.tex}
\input{proof.tex}
\input{isar.tex}
\input{locale.tex}
\input{integration.tex}
\input{ML.tex}
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