distillation

I've received requests for setting up a "conda" installation for BioSTEAM. This is not a priority for now, but any help (resources or direct contributions) would be really helpful!

Thanks :)

When performing distillation in soft or hard mode the way the datasets are concatenated is dubious.
Lightning offers a handy solution to use multiple datasets (see documentation), which will make code much cleaner and easier to understand.