Added Teachers
Lesson selection for teacher
Editting the teacher without setting the lesson
Added Levels
Groups Added
Groups by Levels
Added students with views for general and administrator
reduced role names to 2 char
seeds with all roles of users
Group and Student Views
added price to group
Payments Dates
Fixed bug with generating payment_dates
show amount_to_pay for students
Added Payments (not tested)
Added Sources
Payments tested
improved group editting
Students' payments
group students payment REPORT
Holes added :)