Removed non-class types.  Wrote BUILT-IN-CLASS-OF.
Removed non-class types.  Wrote BUILT-IN-CLASS-OF.

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