0.6.11.7:

0.6.11.7:
	hacking on 0.6.11.5 patches, continued..
	..MAKE-HASH-TABLE :TEST #'EQUAL uses 'EQUAL instead.
	..tested that PRINT-PRETTY-ON-STREAM? stuff doesn't get
		confused on Gray streams
	..added test case for new byte compiler bug
	..removed extra DUP in patched GENERATE-BYTE-CODE-FOR-SET
	new DEFCONSTANT cleanups, as per AL, sbcl-devel, 2001-02-27
	Wrapping DEFCONSTANT +EMPTY-HT-SLOT+ in EVAL-WHEN seems to
		cause problems, so instead I moved the +EMPTY-HT-SLOT+
		definition 'way early in stems-and-flags.lisp-expr.