Feature/introduce label functions

Closed Dennis Gläser requested to merge feature/introduce-label-functions into master

@bernd, @alessio.fumagalli, I added a first draft of the label functions that could be used in the plot script. The second commit uses them in the single case. @alessio.fumagalli, you can have a look at if this makes sense when you dig into making the plots nicer. If you like it we can merge it.

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