1.0.9.60: partial fix for bug in STREAM-ERROR :REPORT

1.0.9.60: partial fix for bug in STREAM-ERROR :REPORT
	* added a new (partially #+NILed out) test case for a bug in
	  STREAM-ERROR :REPORT, where it expects STREAM-ERROR to have
	  SIMPLE-CONDITION-like properties
	* partial fix for bug in test case:
	  ** Define SB-INT:SIMPLE-READER-ERROR which portably behaves
	     the way that pre-ANSI code expected READER-ERROR to behave.
	  ** Redo most internal references to READER-ERROR as references
	     to SB-INT:SIMPLE-READER-ERROR.
	* (This is only a partial fix because PARSE-ERROR and
	  STREAM-ERROR still have similar issues.)