Tue, 11 Aug 2015 11:55:41 +0200 wenzelm register thread such that cancel works;
Mon, 10 Aug 2015 22:34:00 +0200 wenzelm clarified default selection;
Mon, 10 Aug 2015 22:21:55 +0200 wenzelm report final debugger_state more robustly, e.g. after interrupt;
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