Added "Check for updates" button to GUI about tab. Don't check for updates automatically before user request.
Added "Check for updates" button to GUI about tab.
Don't check for updates automatically before user request.

xesscorp/KiCost,xesscorp/KiCost,hildogjr/KiCost,hildogjr/KiCost,xesscorp/KiCost,hildogjr/KiCost