0.9.4.7:

0.9.4.7:
	Commit basically-working ldb backtrace on x86(-64) from David
	Lichteblau (http://www.lichteblau.com/backtrace.diff as
	announced 2005-08-26 on #lisp)
	... unicode symbols not terribly well printed;
	... only lightly tested; heuristics probably a bit broken.