Of%Pdt

[JONL at PARC-MAXC]

Feinberg's note was quite right -- I've already edited the MC
sources for the Gj%Acc change.  I also agree with him that no change
should be made in the Lisp semantics for what appears to be
a CMU-specific bug (failure to update read date doesn't occur
at XX).  Perhaps most TOPS-20 systems do reap the <maclisp> directory,
but the corresponding directory on the ITS machines is maintained
"by hand" for just the reasons noted -- the
difficulty of maintiaining a coherent systems when
critical, but seldom referenced, parts disappear randomly.