Multiple course Attendances, only one ects field for internal representation

[urvdp]

Problem Description:

If one applicant has two courses and does "Zusatzleistung" in one course and receives 3 ECTS instead of 2, then 3 ECTS are also returned for the other course, even though he did not do "Zusatzleistung."

Problem:

Internally, each applicant has one ects field to store the ects points. In the case of multiple courses, the capability to store multiple ects values is exceeded.

Solution:

The number of ECTS points has to be linked to the course attendance and not to the single-applicant model. Add a column "ects" in attendance table and read ects value based on the course from there instead of storing it in the applicant table.

[urvdp]

ToDo:

• [x] add ects column in database in attendance table, remove from applicant
• [x] fill on attendance creation with default course ects
• [x] change logic in edit grade template to load ects from attendance instead from applicant
• [x] Quickfix this semester: change from applicant.ects_points to attendance.ects_points
• [x] test changes
• [x] merge into master

total time: ~3 hours