Added portatiblity not for the docstring of COPY-SEQ.
Added portatiblity not for the docstring of COPY-SEQ.

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