Fix k neighbours

[BadPrograms]

compute_k_nearest_neighbours

• Does not return the node itself as a neighbour of the node
• Returns distances

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.47%. Comparing base (63f8820) to head (8ad2633).
⚠️ Report is 9 commits behind head on v3.x.

Additional details and impacted files

@@           Coverage Diff           @@
##             v3.x      #99   +/-   ##
=======================================
  Coverage   86.47%   86.47%           
=======================================
  Files          20       20           
  Lines        1811     1812    +1     
=======================================
+ Hits         1566     1567    +1     
  Misses        245      245           

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