0.6.12.45:

0.6.12.45:
	(This version/commit actually includes some stuff from the Dave
		MacDonald patch logged in the 0.6.12.44 message, since
		CVS got stuck somehow and didn't finish that commit.)
		(and also left a stale lock in place for days..)
	some *EVAL-STACK* fixes..
	..removed CURRENT-STACK-POINTER macro, since (1) its name is
		confusing (suggesting the system stack, not the eval
		stack; especially since the CURRENT-STACK-POINTER vop
		*does* refer to the system stack!) and (2) abstracting
		away the fact that this is a special variable is,
		given the INTERPRETER-GC-HOOK hack to scrub the eval
		stack, an unfortunate invitation to subtle GC bugs
	..renamed STACK-COPY to EVAL-STACK-COPY
	..made *EVAL-STACK-TRACE* stuff dependent on #!+SB-SHOW
	..renamed EVAL-STACK-SET-TOP to EVAL-STACK-RESET-TOP
	I also made *INTERNAL-APPLY-NODE-TRACE* stuff dependent on
		#!+SB-SHOW, even though in retrospect that was
		probably silly, since it's only in IR1 interpreter
		code, which I hope to blow away next month anyway.