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.
{
    LOCK2(cs_main, cs_wallet);
    CWalletDB walletdb(strWalletFile, "r+");
    std::set<uint256> todo;
    std::set<uint256> done;
    
    assert(mapWallet.count(hashTx));
    CWalletTx& origtx = mapWallet[hashTx];
    if (origtx.GetDepthInMainChain() > 0 || origtx.InMempool()) {
        return false;
    }