0.7.4.9:

	partial fix for FIXME: Stop rebinding *STANDARD-INPUT* on
		entry to debugger. (I'd like to do the same for
		*STANDARD-OUTPUT* too, but this part of the FIXME is
		fairly simple, and needed for SLURP, while that part
		is messier, and not needed immediately.)
	added SLURP debugger command