Fri, 30 Nov 2018 14:46:00 +0100 wenzelm use Isabelle fonts for all GUI look-and-feels;
Fri, 30 Nov 2018 14:21:28 +0100 wenzelm tuned;
Fri, 30 Nov 2018 13:20:38 +0100 wenzelm use older Mac OS X system, for the sake of portability (amending bf5cbefb5c1f);
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