Support arrow input.

[evetion]

Fixes #170

What do we support in terms of input/relative dir as put in the settings? Currently, this ignores the setting completely.

[visr]

Ah, great, surprised that this just works on the Julia side. Indeed since this is input I'd say the path has to be relative to both the TOML directory and the optional input_dir.

Actually, I see input_dir and results_dir are missing from docs.toml, if you feel like addressing that as well.

[evetion]

Ah, great, surprised that this just works on the Julia side. Indeed since this is input I'd say the path has to be relative to both the TOML directory and the optional input_dir.

Actually, I see input_dir and results_dir are missing from docs.toml, if you feel like addressing that as well.

I can add the input_dir, and leave the relative_dir for now, as I think it's unused and should probably be removed. Other naming things should probably be refined and changed in another PR.

[visr]

Great, thanks. I thought relative_dir isn't really a TOML key, it is just a way on the Julia side to interpret all paths relative to the TOML.

[evetion]

Ok, I've now added using input_dir in both reading and writing. I've also added a test in Python to check we can read arrow files back in again (from the relative input_path).

[evetion]

Thanks for the review, all addressed now.