Added method to return the (likely) sektion for which the exam was made ...
Remove any redundant whitespace in sektion's name before titleizing
Send weekly & monthly synopsis only to teachers

Previously, when submissions for all students came together,
it made sense to send a mail when the last attempt was graded.

Now, because of mobile uploads, scans can come in anytime.
Hence, its best to give a weekly and monthly synopsis only.
Merge branch 'gredits'