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 (mapWallet.count(txin.prevout.hash))
                    mapWallet[txin.prevout.hash].MarkDirty();
            }
        }
    }
}
void CWallet::SyncTransaction(const CTransaction& tx, const CBlockIndex *pindex, int posInBlock)
{
    LOCK2(cs_main, cs_wallet);
    if (!AddToWalletIfInvolvingMe(tx, pindex, posInBlock, true))
        return; 
    
    
    
    BOOST_FOREACH(const CTxIn& txin, tx.vin)
    {
        if (mapWallet.count(txin.prevout.hash))
            mapWallet[txin.prevout.hash].MarkDirty();
    }
}
isminetype CWallet::IsMine(const CTxIn &txin) const