Feature/fix duplication removal

[Algiane]

Sorting points by comparing their coordinates is error prone (see issue #120) and can not be used to avoid a double loop when removing point duplications inside the internal communicator of nodes.

This PR removes the point sort and simply uses a double loop to compare all couple of points stored in the communicator. As the number of points in the communicator is low compared to the number of points in the mesh, it will not be time expensive.

Closes #120

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.15%. Comparing base (8769e3f) to head (9f838f9).
Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #122      +/-   ##
===========================================
- Coverage    63.17%   63.15%   -0.03%     
===========================================
  Files           46       46              
  Lines        18968    18960       -8     
  Branches      3546     3546              
===========================================
- Hits         11983    11974       -9     
  Misses        6059     6059              
- Partials       926      927       +1     

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