Obtaining Emacs style time lists

I want to adopt this into the guts of [chamagne](https://github.com/positron-solutions/champagne)

Looks like we have to call `seconds-to-time` on the `ts-unix` result. IMO `ts-emacs` would tighten up the API. Did I miss something?

Some more readers would also be helpful, for plugging into interactive forms to avoid using the various string conversions in `diary-lib` etc. I can maybe upstream some champagne work if you agree that these are needed, although it grows the maintenance surface, I think in a very good way.

Lemme kno