dropCell
dropCell(pBt, pParent, nxDiv, szCell[nCell]);
dropCell(pBt, pPage, pCur->idx, cellSize(pBt, pPage->apCell[pCur->idx]));
dropCell(pBt, pPage, pCur->idx, cellSize(pBt, pCell));
dropCell(pBt, leafCur.pPage, leafCur.idx, szNext);
dropCell(pBt, pPage, pCur->idx, cellSize(pBt, pCell));