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.
{
    LOCK(cs_wallet);
    
    SetMinVersion(FEATURE_HD);
    
    
    
    CHDChain newHdChain;
    newHdChain.masterKeyID = pubkey.GetID();
    SetHDChain(newHdChain, false);
    return true;
}
bool CWallet::SetHDChain(const CHDChain& chain, bool memonly)
{
    LOCK(cs_wallet);
    if (!memonly && !CWalletDB(strWalletFile).WriteHDChain(chain))
        throw runtime_error(std::string(__func__) + ": writing chain failed");
    hdChain = chain;
    return true;
}
bool CWallet::IsHDEnabled()
{
    return !hdChain.masterKeyID.IsNull();
}
int64_t CWalletTx::GetTxTime() const