cobinhood SMT → SocialMedia.Market fix ccxt#3340

[ci skip]

Fix currency conversion in bitfinex2.fetchBalance

I fetchBalance response might look like this:

```
{'info': [['exchange', 'BTC', 0.0028705, 0, None],
  ['exchange', 'ETH', 3.269e-05, 0, None],
  ['exchange', 'IOT', 163.32420707, 0, None]],
 'BTC': {'free': None, 'used': 0.0, 'total': 0.0028705},
 'ETH': {'free': None, 'used': 0.0, 'total': 3.269e-05},
 'IOTA': {'free': None, 'used': 0.0, 'total': 163.32420707},
 'free': {'BTC': None, 'ETH': None, 'IOTA': None},
 'used': {'BTC': 0.0, 'ETH': 0.0, 'IOTA': 0.0},
 'total': {'BTC': 0.0028705, 'ETH': 3.269e-05, 'IOTA': 163.32420707}}
```

As you can see, `IOT` is not properly converted to `IOTA.  Note that the code as returned from bitfinex is `IOT`, and does not have a `t` prefix. `this.currencies_by_id` looks like this:

```
'IOTA': {'id': 'tIOT', 'code': 'IOTA'},
```

Here, the id is prefixed with a `t`. The code in fetchBalance also checks for a prefixed `t`.  Currently then, `commonCurrencyCode` is not called.

[ci skip]

minor edit to binance error handling for "Rest API trading is not ena…

…bled."

[ci skip]

coinex minor edits

[ci skip]

cmc VET vs VEN / lbank ccxt#3179

[ci skip]

lbank fetchMarkets symbols underscore vet_erc20_usdt fix ccxt#3239

[ci skip]

Cobinhood order cost should respect filled amount

Imagine this order:

```
{
    "id": "efdd2453-f415-46d6-92f1-13dbac888565",
    "datetime": "2018-06-23T12:39:30.152Z",
    "timestamp": 1529757570152,
    "lastTradeTimestamp": null,
    "status": "canceled",
    "symbol": "ETH/USDT",
    "type": "limit",
    "side": "sell",
    "price": 469.69,
    "cost": 92.91219704,
    "amount": 0.197816,
    "filled": 0.10610126,
    "remaining": 0.09171473999999999,
    "trades": null,
    "fee": null,
    "info": {
        "id": "efdd2453-f415-46d6-92f1-13dbac888565",
        "trading_pair_id": "ETH-USDT",
        "side": "ask",
        "type": "limit",
        "price": "469.65",
        "size": "0.197816",
        "filled": "0.10610126",
        "state": "cancelled",
        "timestamp": 1529757570152,
        "eq_price": "469.69",
        "completed_at": "2018-06-23T12:39:55.65166Z",
        "source": "exchange"
    }
}
```

Here, the cost calculated by ccxt is wrong, because the order is only half-filled.

[ci skip]

fcoin fetchOrder fix ccxt#3331

[ci skip]

cointiger proper error handling for InsufficientFunds and code 1

[ci skip]

bittrex leftover bug fix ccxt#3329

[ci skip]