Wed, 15 Dec 2010 19:15:06 -0800 huffman add notsqsubseteq syntax
Wed, 15 Dec 2010 20:52:20 +0100 wenzelm show: display goal refinement rule as "state", to avoid odd Output.urgent_message and make its association with the goal more explicit;
Wed, 15 Dec 2010 19:41:24 +0100 blanchet make sure errors generated in a thread don't vanish in cyberspace (e.g., when invoking Sledgehammer with unknown facts)
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