While regtesting with [bitcoin-spock](https://github.com/msgilligan/bitcoin-spock) I noticed at some point the transaction creation via `sendtoaddress -> CreateTransaction()` fails, because the created transaction is larger than `MAX_STANDARD_TX_SIZE`.

During the process a lot of raw transactions are created, which have smallish outputs and when then using `sendtoaddress`, it appears to attempt to create a transaction that spends too many of those dust-ish outputs.

The transaction to create does not have many outputs, but it looks like it's caused by the coin selection, which selects too many inputs. Testing was done with a 0.9 branch, but on the first glimpse I believe this issue is as well be present in 0.10. If this is a known issue, and if there is already a guard against this behavior, I'd be happy about a hint.

Sorry in advance, I do not have a test script to reproduce this issue in an isolated manner. A potential fix would probably require to adjust the coin selection, so that it selects a combination of coins, which, in addition to the size of the rest of the transaction, is still smaller than the limit.

add_coin(available_coins, *wallet, 1 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
        expected_result.Clear();
        add_coin(10 * CENT, 2, expected_result);
        CCoinControl coin_control;
        const auto result11 = SelectCoins(*wallet, available_coins, {}, 10 * CENT, coin_control, coin_selection_params_bnb);
        BOOST_CHECK(EquivalentResult(expected_result, *result11));
        available_coins.Clear();
        
        coin_selection_params_bnb.m_effective_feerate = CFeeRate(3000);
        coin_selection_params_bnb.m_long_term_feerate = CFeeRate(5000);
        add_coin(available_coins, *wallet, 10 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
        add_coin(available_coins, *wallet, 9 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
        add_coin(available_coins, *wallet, 1 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
        expected_result.Clear();
        add_coin(9 * CENT, 2, expected_result);
        add_coin(1 * CENT, 2, expected_result);
        const auto result12 = SelectCoins(*wallet, available_coins, {}, 10 * CENT, coin_control, coin_selection_params_bnb);
        BOOST_CHECK(EquivalentResult(expected_result, *result12));
        available_coins.Clear();
        
        coin_selection_params_bnb.m_effective_feerate = CFeeRate(5000);
        coin_selection_params_bnb.m_long_term_feerate = CFeeRate(3000);
        add_coin(available_coins, *wallet, 10 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
        add_coin(available_coins, *wallet, 9 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
        add_coin(available_coins, *wallet, 1 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
        expected_result.Clear();
        add_coin(9 * CENT, 2, expected_result);
        add_coin(1 * CENT, 2, expected_result);
        coin_control.m_allow_other_inputs = true;
        COutput select_coin = available_coins.All().at(1);