This machine inherits Error_2.

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1. SECD code FCLOSE is expanded to close properly TCP
   connections. It also sets stream pointer to nil.  

2. (fclose stream) function is used in miniOS to leave
   meta_system resources when TCP connection is broken.

3. All stream meta functions are changed to produce runtime
   error if their argument is a nil stream pointer.

4. html documentaion is changed to be adequate to current
   pure_LISP version.     

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Next machine is ?????.
