The important bit is the Unknown library prep in flowcell.py

The rest of it are minor fixes and updates and so on, but the `Unknown` piece means that when the seqrun/libprep data is missing from Charon we will put it there. This means we now run essentially everything in flowcells that are delivered to us / triggered via Guillermo's server.
I'm so used to `-a` that I don't even seem to remember what it exactly does anymore...