Make DE 440(s) solar system ephemeris available

[mhvk]

This ephemeris is the latest and presumably best. Right now, I stated that this would become the default in 5.0, but perhaps that should be 4.3? It is not a difficult change, but a lot of substitutions in our tests, so I thought I'd better ask before doing the work...

fixes #11544

[pllim]

Does this mean we can revert #11564 or not?

[adrn]

Nice! Indeed a simple update. I don't have strong feelings about making the default change now (for v4.3) vs. v5.0.

[mhvk]

OK, I updated the change-log fragment.

I had a quick look at trying to make de440s the default, but found rather many tests started failing (e.g., against the built-in ERFA ephemeris). So, probably best to push that change off and keep this simple.

[mhvk]

OK, tests passed. Once in, I'll put up a PR to change the default, just to show what changes are needed. That will be for 5.0, though.

[adrn]

Great LGTM, thanks!

[adrn]

Was about to hit merge, but then wondered: Do we want to add a test to make sure the new options work? I guess that would mean more remote-data...

[mhvk]

@adrn - should have mentioned that - I indeed decided that checking locally was good enough in this case (which I did...). I'm happy at some point to add a test, but then we should use the cache prefill option that now exist so that we're not hammering the JPL servers...

[adrn]

OK, got it -- I'm fine with enabling this and merging given a local passing check, but perhaps make an issue to remind us to add (infrequently-run) tests to check all possible ephemerides?

[mhvk]

Will do! (But will merge this first so I can have the draft PR with test changes out there too)

[mhvk]

See #11609