allocatePage
rc = allocatePage(pBt, (MemPage**)&pOvfl, pNext, nearby);
rc = allocatePage(pBt, &pChild, &pgnoChild, sqlitepager_pagenumber(pPage));
rc = allocatePage(pBt, &apNew[i], &pgnoNew[i], pgnoNew[i-1]);
rc = allocatePage(pBt, &pRoot, &pgnoRoot, 0);
rc = allocatePage(pBtTo, &pNew, &new, 0);
rc = allocatePage(pBt, &pPage, pTo, 0);