When computing order.GetValue(marketPrice) sometimes we want to use the order.Price and other
times we want to use security.Price, we want to use order.Price if the order's status is either
Filled or PartiallyFilled
QCAlgorithm order functions now return an OrderTicket
OrderTicket can be used to directly update or cancel an order
Placing an order now submits an OrderRequest which is processed by the ITransactionHandler
snugs