Call new DataTable on tables only

[mwouts]

Closes #317

[github-actions]

Thank you for making this pull request.

Did you know? You can try it on Binder: .

Also, the version of ITables developed in this PR can be installed with pip:

pip install git+https://github.com/mwouts/itables.git@select_tables_only

(this requires nodejs, see more at Developing ITables)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.94%. Comparing base (25b58de) to head (b1554f1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
- Coverage   93.95%   93.94%   -0.01%     
==========================================
  Files          28       28              
  Lines        1339     1338       -1     
==========================================
- Hits         1258     1257       -1     
  Misses         81       81              

Flag	Coverage Δ
	93.94% <100.00%> (-0.01%)	⬇️

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