Present.init/finish/no_document are not thread-safe -- eliminated futile CRITICAL sections; tuned;
Present.init/finish/no_document are not thread-safe -- eliminated futile CRITICAL sections;
tuned;

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle