If one calls `fundrawtransaction`, the change address will be retrieved from the keypool, though, this key/address will always be returned to the pool, leading to the problem that the next `getnewaddress()` call will restult in the same key/address.

Either we remove the auto-change-address (users would need to call `getrawchangeaddress` first [current best practice anyway]) or we add a call to keep/mark a specific key/address as change (after one have sent the funded raw transaction).

Reported by @NicolasDorier on IRC.
"3. amount            (numeric) Quantity of " + CURRENCY_UNIT + " to move between accounts.\n"
            "4. (dummy)           (numeric, optional) Ignored. Remains for backward compatibility.\n"
            "5. \"comment\"       (string, optional) An optional comment, stored in the wallet only.\n"
            "\nResult:\n"
            "true|false           (boolean) true if successful.\n"
            "\nExamples:\n"
            "\nMove 0.01 " + CURRENCY_UNIT + " from the default account to the account named tabby\n"
            + HelpExampleCli("move", "\"\" \"tabby\" 0.01") +
            "\nMove 0.01 " + CURRENCY_UNIT + " timotei to akiko with a comment and funds have 6 confirmations\n"
            + HelpExampleCli("move", "\"timotei\" \"akiko\" 0.01 6 \"happy birthday!\"") +
            "\nAs a json rpc call\n"
            + HelpExampleRpc("move", "\"timotei\", \"akiko\", 0.01, 6, \"happy birthday!\"")
        );
    LOCK2(cs_main, pwalletMain->cs_wallet);
    string strFrom = AccountFromValue(request.params[0]);
    string strTo = AccountFromValue(request.params[1]);
    CAmount nAmount = AmountFromValue(request.params[2]);
    if (nAmount <= 0)
        throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount for send");
    if (request.params.size() > 3)
        
        (void)request.params[3].get_int();
    string strComment;
    if (request.params.size() > 4)
        strComment = request.params[4].get_str();
    if (!pwalletMain->AccountMove(strFrom, strTo, nAmount, strComment))
        throw JSONRPCError(RPC_DATABASE_ERROR, "database error");
    return true;
}
UniValue sendfrom(const JSONRPCRequest& request)