Fix failing tests

[PrimozGodec]

Issues and Changes

• Widgets are not PyQt6 compatible - fix PyQt compatibility
• Some widgets still use get_column_view - use get_column instead
• One test start to fail due to the difference in the 16th decimal number - use assertAlmostEqual instead of assertEqual

Includes

• Code changes
• Tests
• Documentation

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.89%. Comparing base (ec0dc2c) to head (2185930).
⚠️ Report is 40 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
- Coverage   83.01%   82.89%   -0.13%     
==========================================
  Files          18       18              
  Lines        3115     3104      -11     
  Branches      362      360       -2     
==========================================
- Hits         2586     2573      -13     
- Misses        474      478       +4     
+ Partials       55       53       -2     

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