Tue, 27 Jul 2010 22:23:32 +0200 wenzelm tuned messages and comments;
Tue, 27 Jul 2010 22:15:51 +0200 wenzelm simplified Thy_Header.read -- include Source.of_string_limited here;
Tue, 27 Jul 2010 22:00:26 +0200 wenzelm simplified/clarified theory loader: more explicit task management, kill old versions at start, commit results only in the very end, non-optional master dependency, do not store text in deps;
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