Sat, 20 Aug 2022 00:24:04 +0200 wenzelm evade clash with index.html (allow "Index.thy" even on case-insensitive file-systems);
Fri, 19 Aug 2022 23:58:44 +0200 wenzelm discontinued special support for README.html (which was hardly ever used in the past 2 decades);
Fri, 19 Aug 2022 21:43:06 +0200 wenzelm clarified directory layout (again): mimic original directory layout, notably ISABELLE_HOME;
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