Fix processing functions

[martinRenou]

Description

Fixing a couple of issues here:

• the output layer name wouldn't always make sense
• the processing config + schema merge script was relying on the order that os.listdir outputs for schema files, which locally for me was messing out everything. We probably have been lucky with the released version. But I don't want to push luck further and fixing the issue here.

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📚 Documentation preview: https://jupytergis--819.org.readthedocs.build/en/819/
💡 JupyterLite preview: https://jupytergis--819.org.readthedocs.build/en/819/lite

[github-actions]

👈 Launch a Binder on branch martinRenou/jupytergis/fix_processing

[martinRenou]

I'll make a quick patch release with this once CI is green

[github-actions]

Integration tests report: appsharing.space

[mfisher87]

I think os.listdir's sort order depends on the operating system. Looks like we still have a listdir call that isn't being re-sorted. Is that important? Or was the issue that with multiple calls to listdir, we relied on their sort order being the same?

[martinRenou]

Or was the issue that with multiple calls to listdir, we relied on their sort order being the same

Yes that was the issue 👍🏽

[mfisher87]

Interesting that it's not; I expected sort order to be arbitrary but stable! Nice catch :)