Tue, 18 May 2021 15:57:49 +0200 wenzelm redundant: copy produced from session document_files;
Tue, 18 May 2021 15:46:03 +0200 wenzelm clarified treatment of Isabelle .sty files;
Tue, 18 May 2021 15:17:55 +0200 wenzelm option document_logo;
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