Expose a number of additional configuration options through generateconfs

[jonasbardino]

We have additional variables that would be useful to have exposed generally in the conf generator:
datasafety_text, datasafety_link, ...

The missing ones can be deducted from the output of
PYTHONPATH=$PWD ; ./mig/install/generatedconfs.py -h
compared to the variables in mig/server/MiGserver.conf

It would be a good starting task to get acquainted with the code base and the overlap.

[jonasbardino]

Thanks for getting the ball rolling with your work to expose the datasafety_X / DATASAFETY_X options @albu-diku . The permanent_freeze / PERMANENT_FREEZE option would be a good next target based on internal discussions and collaboration partner needs.

[jonasbardino]

I've exposed PERMANENT_FREEZE in docker-migrid to actually enable the permanent_freeze conf arg there.

[jonasbardino]

With PR #249 merged we don't actually need to expose options just for the sake of it.