Added recipes for flagged triangular lattices and avg. shortest path length

[thomasrobiglio]

related to #504

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.05%. Comparing base (3b92c02) to head (fb941ce).
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@@            Coverage Diff             @@
##             main     #513      +/-   ##
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+ Coverage   92.03%   92.05%   +0.01%     
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  Files          60       60              
  Lines        4369     4378       +9     
==========================================
+ Hits         4021     4030       +9     
  Misses        348      348              

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[thomasrobiglio]

Also added the recipe suggested in #511

[nwlandry]

"length" not "lenght", "an" not "and", "remove length-0 paths" not "remove lengths 0". The last sentence is a bit confusing to read.

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[nwlandry]

Line #17.    avg_shortest_path = np.sum(lens) / (N * (N-1))

Where is N defined?

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[nwlandry]

I feel like the recipe should be self-contained.

[nwlandry]

Overall, looks good @thomasrobiglio! Nice work! Just a few minor comments to fix and I will approve so that you can merge.

[thomasrobiglio]

Thank you @nwlandry, I might have been a bit tired when I did the commits :)