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.
+ HelpExampleCli("gettransaction", "\"1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d\" true")
            + HelpExampleRpc("gettransaction", "\"1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d\"")
        );
    LOCK2(cs_main, pwalletMain->cs_wallet);
    uint256 hash;
    hash.SetHex(request.params[0].get_str());
    isminefilter filter = ISMINE_SPENDABLE;
    if(request.params.size() > 1)
        if(request.params[1].get_bool())
            filter = filter | ISMINE_WATCH_ONLY;
    UniValue entry(UniValue::VOBJ);
    if (!pwalletMain->mapWallet.count(hash))
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid or non-wallet transaction id");
    const CWalletTx& wtx = pwalletMain->mapWallet[hash];
    CAmount nCredit = wtx.GetCredit(filter);
    CAmount nDebit = wtx.GetDebit(filter);
    CAmount nNet = nCredit - nDebit;
    CAmount nFee = (wtx.IsFromMe(filter) ? wtx.tx->GetValueOut() - nDebit : 0);
    entry.push_back(Pair("amount", ValueFromAmount(nNet - nFee)));
    if (wtx.IsFromMe(filter))
        entry.push_back(Pair("fee", ValueFromAmount(nFee)));
    WalletTxToJSON(wtx, entry);
    UniValue details(UniValue::VARR);
    ListTransactions(wtx, "*", 0, false, details, filter);
    entry.push_back(Pair("details", details));
    string strHex = EncodeHexTx(static_cast<CTransaction>(wtx), RPCSerializationFlags());
    entry.push_back(Pair("hex", strHex));
    return entry;
}
UniValue abandontransaction(const JSONRPCRequest& request)