Added elongation for pintk

[dlakaplan]

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (9b4739e) 68.50% compared to head (334fab7) 68.49%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1655      +/-   ##
==========================================
- Coverage   68.50%   68.49%   -0.01%     
==========================================
  Files         104      104              
  Lines       24264    24267       +3     
  Branches     4329     4330       +1     
==========================================
  Hits        16622    16622              
- Misses       6555     6558       +3     
  Partials     1087     1087              

Files	Coverage Δ
src/pint/pintk/pulsar.py	33.43% <ø> (ø)
src/pint/pintk/plk.py	13.47% <0.00%> (-0.05%)	⬇️

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[abhisrkckl]

What happens in the case of a timing model without an Astrometry component? (e.g. for already barycentered TOAs)

[dlakaplan]

I think that is a separate issue. The buttons for e.g., orbital phase and frequency are present even for data that don't have a binary and don't have frequency info. Pressing those leads to non-fatal errors. Probably that should be fixed separately.

[abhisrkckl]

I'll merge this if this is ready.

[dlakaplan]

I think it's ready. I added #1658 to deal with the other cases you asked about