Code fixes

[nikml]

• Glossary Covariate shift definition update
• Remove duplicate confidence upper bound functionality
• remove unneeded __deepcopy__ method
• mypy and flake8 fixes for cbpe
• don't allow confidence bands to go outside threshold value limits for missing values
• fixes for CM element threshold value limit logic

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (57a6d38) 80.02% compared to head (069496a) 80.06%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
+ Coverage   80.02%   80.06%   +0.03%     
==========================================
  Files         107      107              
  Lines        7981     7964      -17     
  Branches     1451     1446       -5     
==========================================
- Hits         6387     6376      -11     
+ Misses       1270     1264       -6     
  Partials      324      324              

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