Roll marking screen modifications

1. In v 8.0.35 and above there has been a change when lesson length has been modified.
When lesson length has been modified, the pencil now has an orange box around it. If you hover over the pencil/orange box, you will see a description eg. "Lesson length modified from 0:30 to 0:45 for this week only".

​On the Attendance Record screen (the one you see when you click 'Search for and view records' in What Do You Want To Do > Roll-marking: Tuition), the PAY COUNT field will be shaded orange if the lesson length has been modified. Again a description can be seen if you hover over the field. 
Also added a key explaining the shading at the bottom of the Attendance Record screen.
NOTE: These things have NOT been added to the 'GC' (Geelong College) screens. 

2. In v 8.0.36 and above a little green + button has been added to the far right of each student record. Clicking this adds another lesson for the student for that week. (It duplicates the selected record but then clears the Day/Date/Time/Notes/Attendance Code, etc. fields.) Allows teachers to easily enter makeup lessons for that week (perhaps on a different day or time)