Fixed a problem in the nsubst functions.  A test that checked for (atom tree) should be (atom (cdr tree)).
Fixed a problem in the nsubst functions.  A test that checked for
(atom tree) should be (atom (cdr tree)).

vtomole/SICL,vtomole/SICL,clasp-developers/SICL,clasp-developers/SICL,vtomole/SICL,vtomole/SICL,clasp-developers/SICL,clasp-developers/SICL