Thu, 24 Apr 2014 13:54:45 +0200 wenzelm eliminated pointless output actors;
Thu, 24 Apr 2014 13:40:29 +0200 wenzelm more robust shutdown;
Thu, 24 Apr 2014 13:13:48 +0200 wenzelm consumer thread with unbounded queueing of requests (similar to Message_Channel in ML);
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