removed python compatibility

[badasahog]

closes #7069

There's a lot I can do from here to remove static/global objects and speed up the code.

More to come.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.01%. Comparing base (3bb2e76) to head (90a4db4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7206   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files          81       81           
  Lines       15477    15477           
=======================================
  Hits        15325    15325           
  Misses        152      152           

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[github-actions]

• HEAD=pythonRemoval slower P<0.001 for DT[by,verbose=TRUE] improved in #6296
  

Generated via commit 90a4db4

Download link for the artifact containing the test results: ↓ atime-results.zip

Task	Duration
R setup and installing dependencies	4 minutes and 42 seconds
Installing different package versions	9 minutes and 47 seconds
Running and plotting the test cases	2 minutes and 33 seconds

[MichaelChirico]

Thanks! I will allow this to dwell for a while (say 3-6 months after the issue was posted) in case the original authors/pydatatable maintainers decide to weigh in

[badasahog]

I think it can be confirmed by just looking at the code? It's pretty clear from the datatable codebase that the paths have diverged for some time now.

[MichaelChirico]

I'm not sure if there's another repo (possibly private?) that has been split off

[ben-schwen]

LGTM TY