Qt object on Gradebook

Done:

1. change scores by spinbox or horizontalbars
2. when any score changes, the total socre is also changed
3. there are two schemes to calculate the grade
4. "show result" button shows result in a pop-u window
5. press "close" to close the window
6. radio button should is set to Scheme A before the user do anything

Undone:

1. radio button is not connected to score change yet
2. What should pic 10a/ 10b do????