More tests for warnings

[eduardo-rodrigues]

Better coverage of warnings and a minor fix to some logic for the creation of charge-conjugate decay chains.

Some of the code could be simplified and reorganised. That's for the future. At this point it was more important to provide better functionality, warnings and related tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.05%. Comparing base (faf1703) to head (2f1b682).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #638      +/-   ##
==========================================
+ Coverage   98.04%   98.05%   +0.01%     
==========================================
  Files           6        6              
  Lines        1276     1283       +7     
==========================================
+ Hits         1251     1258       +7     
  Misses         25       25              

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