JPLSpec is even more down

[keflavich]

This is a harder workaround for jplspec being down: it switches to using the wayback machine instead of jpl's server, which has gone totally unresponsive.

This raises bigger questions about data preservation/curation. Can't answer those here, but here's a 🩹 .

[bsipocz]

This needs a changelog. And maybe separating out into two PRs, one for the backup url (I expect that to get merged quickly); and the other for the new kwarg (if it needs more work)?

[keflavich]

The backup doesn't do anything without the new kwarg, so these should go together. I will fix the failures tonight - this was an emergency patch with my student, since she needs access now.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.24%. Comparing base (e49f51a) to head (a94b6ec).
⚠️ Report is 137 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3547      +/-   ##
==========================================
+ Coverage   72.66%   73.24%   +0.57%     
==========================================
  Files         219      226       +7     
  Lines       20478    20968     +490     
==========================================
+ Hits        14880    15357     +477     
- Misses       5598     5611      +13     

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