void casewindow_pop_tail (struct casewindow *, casenumber cnt);
struct ccase *casewindow_get_case (const struct casewindow *,
casenumber case_idx);
void casewindow_pop_tail (struct casewindow *, casenumber cnt);
struct ccase *casewindow_get_case (const struct casewindow *,
casenumber case_idx);