added compute_neighbours_in_radius

[BadPrograms]

!!!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.49%. Comparing base (63f8820) to head (a82cdb1).
⚠️ Report is 9 commits behind head on v3.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             v3.x     #100      +/-   ##
==========================================
+ Coverage   86.47%   86.49%   +0.02%     
==========================================
  Files          20       20              
  Lines        1811     1814       +3     
==========================================
+ Hits         1566     1569       +3     
  Misses        245      245              

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[BadPrograms]

Just realized this is the 100th PR!!! 🍾🍾🍾