0.pre7.58:

	(aside: I screwed up CVS checkin somehow on the last version.
		My local backend.lisp was modified by CR's patch but
		for some reason didn't make it into the CVS repository.
		Hopefully this checkin will take care of the problem.)
	renamed the 8-bit tag codes from FOO-TYPE to FOO-WIDETAG,
		and from type_FooBar to FOO_BAR_WIDETAG. (I used
		WIDETAG instead of just TAG because I figure as long
		as I'm trying to reduce the ambiguities of TYPE in old
		names, I might as well minimize the ambiguity of TAG
		(in the sense of THROW/CATCH) in the new names too.)
	also s/fun-header-types/fun-header-widetags/
	renamed TYPE-BITS to N-WIDETAG-BITS, and TYPE-MASK to
		WIDETAG-MASK
	renamed TypeOf to widetag_of
	renamed lowtagof to lowtag_of
	renamed LOWTAG-BITS to N-LOWTAG-BITS
	renamed TYPE_MASK to WIDETAG_MASK
	renamed N_TYPE_BITS to N_WIDETAG_BIGS