Disabled axes for pintk when not in timing model or data

[dlakaplan]

• Disabled "elongation" axes when no Astrometry component present
• Disabled "orbital phase" axes when no Binary component present
• Disabled "frequency" axes when <=1 frequency value present or when frequencies are not finite
• Also changed default pintk fitters to downhill versions (Default fitter in pintk should be determined using Fitter.auto() #1665)
• Also changed general is_binary property to rely on class inheritance rather than component name

Example on a barycentered dataset (so no Astrometry or Binary component and all event data):

[abhisrkckl]

Disabled "frequency" axes when <=1 frequency value present

I think this should also be disabled when infinite-frequency TOAs are present.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (2977542) 68.50% compared to head (c8f98b9) 68.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1663      +/-   ##
==========================================
- Coverage   68.50%   68.46%   -0.05%     
==========================================
  Files         104      104              
  Lines       24276    24287      +11     
  Branches     4333     4336       +3     
==========================================
- Hits        16631    16628       -3     
- Misses       6560     6573      +13     
- Partials     1085     1086       +1     

Files	Coverage Δ
src/pint/scripts/pintk.py	23.28% <100.00%> (ø)
src/pint/pintk/pulsar.py	33.43% <0.00%> (ø)
src/pint/pintk/plk.py	13.42% <9.09%> (-0.06%)	⬇️

... and 2 files with indirect coverage changes

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[dlakaplan]

Done. also fixed a bug regarding initial log level

[abhisrkckl]

Can you also change the TimingModel.is_binary method to use isinstance instead of a string-based condition?

[dlakaplan]

I did that. Not sure it's better (it requires a local import to avoid circular import errors).

[dlakaplan]

I had to undo those changes because of various failures

[abhisrkckl]

This looks good to me. Shall I merge this?

[dlakaplan]

I think so