Improve convert_chunk_header for YAML options

[cderv]

• Use - and not . for options name
• Use the new aliases for dev and dpi

This also fix an issue with numeric conversion because yaml::as_yaml to consider a precision that we don't want here I believe.

[cderv]

Thanks! I'll merge dash_names() with dot_names() later.

I figured you would want to do that 😅

Sorry I got lazy and it was easier to write another function for me 🙄 😄

[cderv]

Thanks a lot for the fixes !