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On your issue, if I understand correctly, you want to control your Pi’s GPIOs through homegear directly but running openHABian ?
While that might have worked in the past or not, the root cause of your problem is that you use a conceptually wrong approach. You’re apparently coming from the HM/homegear world, but openHABian is built to support openHAB, not homegear as the controller.
If you wanted to use the RPI as an acutator, i.e. control GPIO directly, you would need to use a GPIO openHAB binding.
GPIO access from OH(ian) has been unchanged in a long time so I believe it’s still working fine.
Adding homegear user to a UNIX group that has write access to GPIO devices will probably do the trick, but as I said your concept is broken and not supported in openHAB(ian).