Thu, 16 Jul 2020 20:34:21 +0200 wenzelm clarified theory data: more robust merge;
Thu, 16 Jul 2020 16:53:08 +0200 wenzelm proper import sessions;
Thu, 16 Jul 2020 16:48:12 +0200 wenzelm more thorough extend/merge (for Theory.join_theory);
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