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);
            std::map<uint256, int>::iterator mi = mapRequestCount.find(hash);
            if (mi != mapRequestCount.end())
                (*mi).second++;
        }
    }
    void GetScriptForMining(boost::shared_ptr<CReserveScript> &script);
    void ResetRequestCount(const uint256 &hash)
    {
        LOCK(cs_wallet);
        mapRequestCount[hash] = 0;
    };
    
    unsigned int GetKeyPoolSize()
    {
        AssertLockHeld(cs_wallet); 
        return setKeyPool.size();
    }
    bool SetDefaultKey(const CPubKey &vchPubKey);
    
    bool SetMinVersion(enum WalletFeature, CWalletDB* pwalletdbIn = NULL, bool fExplicit = false);
    
    bool SetMaxVersion(int nVersion);
    
    int GetVersion() { LOCK(cs_wallet); return nWalletVersion; }