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.
{
    CWalletDB walletdb(strWalletFile);
    return GetAccountBalance(walletdb, strAccount, nMinDepth, filter);
}
CAmount CWallet::GetAccountBalance(CWalletDB& walletdb, const std::string& strAccount, int nMinDepth, const isminefilter& filter)
{
    CAmount nBalance = 0;
    
    for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
    {
        const CWalletTx& wtx = (*it).second;
        if (!CheckFinalTx(wtx) || wtx.GetBlocksToMaturity() > 0 || wtx.GetDepthInMainChain() < 0)
            continue;
        CAmount nReceived, nSent, nFee;
        wtx.GetAccountAmounts(strAccount, nReceived, nSent, nFee, filter);
        if (nReceived != 0 && wtx.GetDepthInMainChain() >= nMinDepth)
            nBalance += nReceived;
        nBalance -= nSent + nFee;
    }
    
    nBalance += walletdb.GetAccountCreditDebit(strAccount);
    return nBalance;
}
std::set<CTxDestination> CWallet::GetAccountAddresses(const std::string& strAccount) const