fix the error message when selecting packages
remove the redudent tradepanel when switching to a less complex strategy
fix bug on displaying total after calculation under Strategy
Test on checking on option price in portfolio.
Time value decreases as option price increases
made some change on the buttons layout in portfolioview
implement strategy view in poprtfolio view
restructure the gui of strategy selection
fix the bug on not purchasing short option
remove unwanted derby, added in DatePicker
raw data testing set updated
fixed the bug on "split" caused by new raw data in run time
allow automatic expiration of option
Added in TradeView