Lucas Bickel 6e03863fa1 Problem: Billing is always on
Solution: Make billing configurable through LIBRETIME_ENABLE_BILLING and deactivate it

This should catch all the changes needed to deactive billing in LibreTime.

* [x] only call billing when it is enabled
* [x] let super admins edit their info
* [x] dont link to billing if it is disabled
2017-03-03 15:34:54 +01:00
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