Merge pull request #85 from mehere/dev

Pull Request from dev -> dev-wee on 5/3
Added a patch to restrict the number of excess lesson to be smaller or equal to the number of relief lesson.

Note: As a result, some teachers will consistently have number of teaching periods > recommended number.
Merge branch 'dev-wee' of https://github.com/mehere/RTSS.git into dev-wee
Merge pull request #86 from mehere/dev-wee

Fixed the number of skipped lesson < Relief Lesson