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.
InitWarning(AmountHighWarn("-minrelaytxfee") + " " +
                    _("The wallet will avoid paying less than the minimum relay fee."));
    if (IsArgSet("-mintxfee"))
    {
        CAmount n = 0;
        if (!ParseMoney(GetArg("-mintxfee", ""), n) || 0 == n)
            return InitError(AmountErrMsg("mintxfee", GetArg("-mintxfee", "")));
        if (n > HIGH_TX_FEE_PER_KB)
            InitWarning(AmountHighWarn("-mintxfee") + " " +
                        _("This is the minimum transaction fee you pay on every transaction."));
        CWallet::minTxFee = CFeeRate(n);
    }
    if (IsArgSet("-fallbackfee"))
    {
        CAmount nFeePerK = 0;
        if (!ParseMoney(GetArg("-fallbackfee", ""), nFeePerK))
            return InitError(strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"), GetArg("-fallbackfee", "")));
        if (nFeePerK > HIGH_TX_FEE_PER_KB)
            InitWarning(AmountHighWarn("-fallbackfee") + " " +
                        _("This is the transaction fee you may pay when fee estimates are not available."));
        CWallet::fallbackFee = CFeeRate(nFeePerK);
    }
    if (IsArgSet("-paytxfee"))
    {
        CAmount nFeePerK = 0;
        if (!ParseMoney(GetArg("-paytxfee", ""), nFeePerK))
            return InitError(AmountErrMsg("paytxfee", GetArg("-paytxfee", "")));
        if (nFeePerK > HIGH_TX_FEE_PER_KB)
            InitWarning(AmountHighWarn("-paytxfee") + " " +
                        _("This is the transaction fee you will pay if you send a transaction."));