Garbage collector

[KDF at MIT-AI (Ken Forbus)]

	When the GC-process window decides to expose itself, it does NOT
de-expose itself and let the normal processing continue.  This makes it very
hard to run programs unattended when the GC is on.  There is also an unfortunate
state wherein the GC seems to have done its job, all three lights flash in various
combinations and orders, the "wholine" tag is NIL, and despite updating the mouse
occasionally, the system menu will not pop up.  Sigh.
		Ken