Profit Factor added to stats

The statistics at the top of the Detailed reports tab now includes Profit Factor. It is also on the Win/Loss Days tab and the Compare tab, for each trade group.

In gross reporting mode, the profit factor is calculated as

    profit factor = gross profits / gross losses

In net reporting mode (for gold subscribers), the profit factor is

    profit factor = net profits / net losses

Where net profits and losses are the gross profits/losses, less commissions and fees.