provide dummy thread structures, including proper Thread.getLocal/setLocal;
moved task/schedule to Concurrent/schedule.ML;
\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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