ATOM applied to a hunk?

[JONL at MIT-MC (Jon L White)]

Carl, Jonathan, and I just re-hashed the old question of
ATOM versus HUNKs last week - admittedly it is too late
to change the meaning of ATOM (to be "not listp") when
there are still users who prefer the more limited use 
of it.  But in fact I think I've fixed SUBST for hunks
today - will be in the next release of LISP;  regardless
of the "ATOM" question, hunks must be considered
destructurable by the various funcitons which trace over
structure - e.g., PRINT, FLATSIZE, EQUAL, SUBST, PURCOPY.