This git commit adds CTDAS functionality into the processing chain.

I had to mildly modify some bits of the core code to make them work on Santis and (compared to other jobs) this doesn't run everything as separate SLURM jobs but runs mostly on the front node. For example, I'm running the ERA-5 data requests on the front node, because after making a request we're just waiting for an hour (or two!) before the result is ready to be downloaded, which is not something you want to submit to the supercomputer. The changes I made shouldn't break any of the existing cases.

We discussed this case won't be part of the test case, so it's up to Empa to maintain this processing chain case.