Byebye fixed point voodoo
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Beginning with 2nd June, only the "Single Sign On" option for login to the GitLab web interface will be possible. If you don't have an MPCDF wide second factor so far, please get one at our SelfService (https://selfservice.mpcdf.mpg.de). The GitLab internal second factor will not work.
Removes some fairly complicated code from the code base, since it is unused. The essential parts are only commented out, though, in case we might need it again.