WIP: New split lib workflow

We need to:
- [ ] check that meta-analysis is still working
- [ ] finish preprocessing (split libs) connect per prep template
- [ ] make preprocessing async
- [ ] be able to connect to other studies raw data
- [ ] fix metadata summary per prep template
- [ ] add EBI submission
I will fix but note that IMOO this is a waste of time: supporting something
that we do not currently support -> Python 3. Basically, as is not
supported/tested, people needs to check by eye that it complies.