0.8.19.3:

0.8.19.3:
	DELETE THE DRAGON

	Implement fixed-format floating point through FLONUM-TO-DIGITS.
	Essentially this means a whole heap of hairy logic in
	FLONUM-TO-STRING, and the deletion of the Steele & White
	Dragon algorithm.

	... fixes (format nil "~@F" 1.23)
	... fixes (format nil "~3F" -0.0)
	... fixes (format nil "~G" 1d23)
	... fixes (format nil "~E" 1d23)
	... fixes bug 317
	... does not fix bug 19, which I think is not a bug
	... fixes all sorts of other stuff

	It probably also breaks something, because test coverage of
	this area is definitely patchy.