bt_rcpush
static int bt_rcpush(RCURSOR *, db_pgno_t, u_int);
status = bt_rcpush(rc, h->pgno, 0);
status = bt_rcpush(rc, h->pgno, NEXTINDEX(h) - 1);
status = bt_rcpush(rc, h->pgno, idx);
status = bt_rcpush(rc, h->pgno, idx);