Fri, 27 Aug 2010 16:32:11 +0200 wenzelm eliminated unnecessary ref;
Fri, 27 Aug 2010 16:29:12 +0200 wenzelm clarified iter_deepen_limit vs meson (cf. 7c5896919eb8) -- eliminated global ref;
Fri, 27 Aug 2010 15:46:08 +0200 wenzelm disposed some old debugging tools;
Fri, 27 Aug 2010 15:07:35 +0200 wenzelm proper configuration option "show_proofs";
Fri, 27 Aug 2010 14:14:08 +0200 wenzelm structure Unsynchronized is never opened and set/reset/toggle have been discontinued;
Fri, 27 Aug 2010 14:07:09 +0200 wenzelm expanded some aliases from structure Unsynchronized;
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