Sat, 29 Dec 2018 16:11:24 +0100 wenzelm clarified signature;
Sat, 29 Dec 2018 14:58:51 +0100 wenzelm clarified errors, according to Isabelle/MMT;
Sat, 29 Dec 2018 13:49:09 +0100 wenzelm tuned, according to Isabelle/MMT;
Sat, 29 Dec 2018 13:15:13 +0100 wenzelm clarified options: ensure consolidated Node_Status and thus percentage = 100% for progress;
Sat, 29 Dec 2018 12:52:58 +0100 wenzelm tuned;
Sat, 29 Dec 2018 17:38:29 +0100 nipkow merged
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