Introduced APPEND-CLAUSE as a common superclass of existing APPEND-... clauses.
Introduced APPEND-CLAUSE as a common superclass of existing APPEND-... clauses.

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