Deprecate: deprecate setValue and remove deprecated Python2 objects

[cadenmyers13]

Deprecation of Parameter.setValue

There are a lot of methods in srfit called def setValue, but i only deprecated the one inside Parameter because that seems to be the only user-facing one. If a user wants to create a new parameter it is done through this object. The other uses of def setValue I just replaced with def set_value and did not mark with the deprecator.

Also, in src/diffpy/srfit/equation/literals/abcs.py I removed the use of six and other python 2 objects. I did this with the help of chatGPT

[cadenmyers13]

@sbillinge ready for review

[codecov]

Codecov Report

❌ Patch coverage is 53.52113% with 66 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.81%. Comparing base (08478d4) to head (6d0de27).
⚠️ Report is 1 commits behind head on v3.3.0.

Files with missing lines	Patch %	Lines
tests/test_speed.py	0.00%	49 Missing ⚠️
tests/test_objcrystparset.py	0.00%	8 Missing ⚠️
tests/test_diffpyparset.py	0.00%	5 Missing ⚠️
tests/test_pdf.py	0.00%	2 Missing ⚠️
tests/test_sas.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           v3.3.0     #167   +/-   ##
=======================================
  Coverage   72.81%   72.81%           
=======================================
  Files          25       25           
  Lines        3896     3896           
=======================================
  Hits         2837     2837           
  Misses       1059     1059           

Files with missing lines	Coverage Δ
tests/test_builder.py	100.00% <100.00%> (ø)
tests/test_constraint.py	96.96% <100.00%> (ø)
tests/test_contribution.py	99.58% <100.00%> (ø)
tests/test_equation.py	100.00% <100.00%> (ø)
tests/test_fitrecipe.py	99.85% <100.00%> (ø)
tests/test_literals.py	99.17% <100.00%> (ø)
tests/test_parameter.py	98.14% <100.00%> (ø)
tests/test_recipeorganizer.py	99.69% <100.00%> (ø)
tests/test_restraint.py	96.87% <100.00%> (ø)
tests/test_visitors.py	99.19% <100.00%> (ø)
... and 6 more

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[cadenmyers13]

Ah, codecov failed.. one sec

[cadenmyers13]

Since there were a lot of calls to .setValue changed to .set_value in tests, codecov is failing. I think we can just ignore this since we're technically not missing any coverage

[sbillinge]

Since there were a lot of calls to .setValue changed to .set_value in tests, codecov is failing. I think we can just ignore this since we're technically not missing any coverage

Don't we have tests for set_value though? Please check, because if we do, then these lines should have coverage, no?