* Write a paragraph that informs contributors about the openID test
accounts that are available and provide instructions on how to
enable them in development (#1315) in CONTRIBUTING.md
* Add missing environment variable for openID logins via openSUSE
(OSEM_SUSE_KEY, OSEM_SUSE_SECRET) in dotenv.example
Also, the part of the schedule event is deleted and the length of the event types
changes to the nearest suitable after changing the length of the interval.
This closes#1220