(rasqal_rowsequence_rowsource_read_all_rows): Deep copy rows

src/rasqal_rowsource_rowsequence.c

@@ -180,7 +180,7 @@ rasqal_rowsequence_rowsource_read_all_rows(rasqal_rowsource* rowsource,
  int size = raptor_sequence_size(con->seq);
  for(i = 0; i < size; i++) {
  rasqal_row *row = (rasqal_row*)raptor_sequence_get_at(con->seq, i);
- raptor_sequence_push(seq, rasqal_new_row_from_row(row));
+ raptor_sequence_push(seq, rasqal_new_row_from_row_deep(row));
  }
  }