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.
if (!wtxIn.hashUnset())
        {
            if (mapBlockIndex.count(wtxIn.hashBlock))
            {
                int64_t latestNow = wtx.nTimeReceived;
                int64_t latestEntry = 0;
                {
                    
                    int64_t latestTolerated = latestNow + 300;
                    const TxItems & txOrdered = wtxOrdered;
                    for (TxItems::const_reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
                    {
                        CWalletTx *const pwtx = (*it).second.first;
                        if (pwtx == &wtx)
                            continue;
                        CAccountingEntry *const pacentry = (*it).second.second;
                        int64_t nSmartTime;
                        if (pwtx)
                        {
                            nSmartTime = pwtx->nTimeSmart;
                            if (!nSmartTime)
                                nSmartTime = pwtx->nTimeReceived;
                        }
                        else
                            nSmartTime = pacentry->nTime;
                        if (nSmartTime <= latestTolerated)
                        {
                            latestEntry = nSmartTime;
                            if (nSmartTime > latestNow)
                                latestNow = nSmartTime;