Rewrote the nconc function using more primitive constructs, so as to avoid depending on (loop ... nconc ...) working correctly, which it is known not to do in some implementations.
Rewrote the nconc function using more primitive constructs, so as
to avoid depending on (loop ... nconc ...) working correctly, which
it is known not to do in some implementations.

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