Sat, 22 Aug 2020 14:48:00 +0200 wenzelm proper treatment of absolute deadline vs. relative timeout;
Sat, 22 Aug 2020 13:55:42 +0200 wenzelm clarified session: no parent image for minor theory imports;
Sat, 22 Aug 2020 13:21:58 +0200 wenzelm removed obsolete created_temp_dir: ISABELLE_TMP is always present for the running Isabelle/ML process;
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