issue with appointment duration

#66 (closed) implementation causes a bug with the computation of the appointment duration. I'll work on a fix.

Just remember that some of the appointment types have duration time that is not counted in the sum, but is taken as a max value (so the task can be done in parallel in separate room).

For me logic behind this a bit fuzzy, but it's a user request.

You can observe it in production for appointment type: AQUEST, I'm not sure if you have in your test db.

The implementation can be found here: https://git-r3lab.uni.lu/piotr.atyjaszyk/scheduling-system/blob/master/smash/web/static/js/appointment.js#L28

created branch 78-issue-with-appointment-duration

mentioned in merge request !25 (merged)

removed assignee

mentioned in commit e924c524

closed via commit ef4af73e