Sum of envelopes + example

[RoccoRaimo]

Hi @ccaprani!
I've implemented the new method in class Envelopes to sum multiple envelopes, as described in #92, and included the example n.5 to show a possible usage scenario.

Let me know if everything is straight and clear!
Thanks.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 7.14286% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 82.64%. Comparing base (9322c65) to head (66363c2).
Report is 17 commits behind head on main.

Files	Patch %	Lines
src/pycba/results.py	7.14%	13 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
+ Coverage   79.97%   82.64%   +2.67%     
==========================================
  Files          13       13              
  Lines        1368     1596     +228     
==========================================
+ Hits         1094     1319     +225     
- Misses        274      277       +3     

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[ccaprani]

This is great 😃 I haven't yet looked at the notebook, but are there any tests that would make sense to add for the new functionality?

[RoccoRaimo]

At the end of the example in the notebook I inserted a numerical control of the results between a "manual" sum of the results and the "automatic" one that comes with the use of the new function.
Don't know if it makes sense to create a separate test. Let me know once you'll look up at the notebook :)

[RoccoRaimo]

Hi Colin! Have you had a look at the notebook with the example on it?