Tue, 16 Jan 2018 11:30:03 +0100 wenzelm clarified markup;
Tue, 16 Jan 2018 11:27:52 +0100 wenzelm discontinued old form of marginal comments;
Tue, 16 Jan 2018 09:58:17 +0100 wenzelm tuned document;
Tue, 16 Jan 2018 09:58:06 +0100 wenzelm clarified comments;
Tue, 16 Jan 2018 09:30:00 +0100 wenzelm standardized towards new-style formal comments: isabelle update_comments;
Tue, 16 Jan 2018 09:12:16 +0100 wenzelm uniform treatment of old-style and new-style comments;
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