Explore compressing artifacts

[Sbozzolo]

Many of our artifacts are created without compression. We can reduce their size by enabling maximum compression (set deflatelevel = 9).

https://alexander-barth.github.io/NCDatasets.jl/dev/variables/#Creating-a-variable

[ph-kev]

With PR #81, there is a trade off between compression and reading data. Compression can slow down loading data since you need to decompress the data when loading it.