* Define new standard ports to replace nearly all instances of

* Define new standard ports to replace nearly all instances of
  NEAREST-CMDL/PORT.  When a CMDL starts, it binds all of these ports
  to the CMDL port; but they can each be rebound separately without
  affecting the CMDL port.

	(ERROR-OUTPUT-PORT)		errors and warnings
	(NOTIFICATION-OUTPUT-PORT)	load messages, etc.
	(TRACE-OUTPUT-PORT)		output from TRACE
	(INTERACTION-I/O-PORT)		prompting

* Implement IGNORE-ERRORS procedure.  Change WRITE-CONDITION-REPORT so
  that it ignores errors that occur while writing the report, but only
  if the condition being reported is an error condition.

* Implement GUARANTEE-I/O-PORT.