new PCL on Explorers

[Dan Cerys <cerys@bbn.com>]

Dave,  

There is a patch from TI for the Explorer problem of DEFSETF and &rest
args.  You should be able to get it by calling your friendly TI support
folks.

BUT, this fix will only get you over one problem onto another.  You will
then run into a problem the first time add-method is called in vector.lisp.
It looks like a macro expansion problem that results in RPLACA of NIL.  I 
haven't had the time to check whether this is a TI problem or problem in
the TI-specific PCL code (i.e., in FIN.LISP).  If you find the problem, please
let us know about it.

Dan