- Add relion/2.1 with openmpi/4.0.4_slurm
- Add relion/3.0.8-1 with openmpi/4.0.5_slurm
- Mark 3.1.0-1 and 3.1.1 as stable
- Deprecate all older versions (betas and versions with openmpi/3.1.4
and older, which don't work with the current configuration)