cut ohlcvs down to 6 values for consistency with the Manual

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poloniex parseTcker php fix ccxt#2078

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binance fetchOpenOrders symbol requirement removed ccxt#2068

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1.10.1240

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1.10.1239

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1.10.1238

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Throw OrderNotFound if order not found in fetchOrderTrades

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last + open → this.sum (last, open) in parseTicker for bithumb, bitme…

…x, cryptopia, hitbtc2, huobipro, poloniex fix ccxt#2066

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_1btcxe ticker timestamp and parseDate added to js/py/php

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added a comment on Console/Table.php to examples/php/arbitrage-pairs.php

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