rem: return Insert(transaction, (uint8 *)&key, sizeof(key), value);
add: return Insert(transaction, (uint8 *)key, strlen(key), value);
context: BPlusTree::Insert(Transaction &transaction, uint64 key, off_t value){	if (fHeader->data_type != BPLUSTREE_UINT64_TYPE)		return B_BAD_TYPE;	return Insert(transaction, (uint8 *)&key, sizeof(key), value);}