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
Every instantiation requires a query against the database, therefore requiring IO. This isn't premature optimization, it is standard practice with tornado to async IO operations as to not block the ioloop.