Sun, 05 Jul 2015 19:12:52 +0200 wenzelm clarified context;
Sun, 05 Jul 2015 19:08:40 +0200 wenzelm clarified context;
Sun, 05 Jul 2015 16:44:59 +0200 wenzelm eliminated spurious warning/tracing messages -- avoid Display.string_of_thm_without_context;
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