Apply merging of sub rows for HTML table, too | Refactor and comment | Add __eq__ to API objects to improve matching

Location: Event.create()
Problem: Got absence by id without filtering by term or school year
Solution: Use run_one of api.py, which filters automatically

[UNTIS] All teachers can be got from [new] untisconnect api | Basic timetable app with all teachers in a list | Untisconnector app for models/api from [UNTIS]