Unclear how to overwrite a dataset

[hyanwong]

I'm using sgkit.save_dataset in a notebook. Often the cell gets run several times, but after the first time, the call fails because it won;t overwrite the existing file. It's unclear from the docs how to set "overwrite=True", which I would imagine is a common requirement. I haven't actually figured out how to do this yet.

[hyanwong]

Ah, I found it: mode="w". It took me a fair while though.

[jeromekelleher]

Overall the write path is very unclear to me also. The documentation needs to be clearer on what's xarray's responsibility, and what is coming from sgkit. However, this would need a major refactoring, and we are focusing efforts elsewhere.