0.8.0.78:

	Fix SLOT-MISSING/SLOT-UNBOUND bugs found by Paul Dietz' test
	suite
	... return a single value for SLOT-VALUE, the new value for
		(SETF SLOT-VALUE), a boolean equivalent for SLOT-BOUNDP
		and the object for SLOT-MAKUNBOUND
`	... adjust a bogus test in our regression test suite :-/