Modified rule for assigning parallel edge owners

[corentin-prigent]

Prior to this update, edge owners were chosen as the lowest rank proc owning the edge. This could cause discrepancy with orientation rules for physical triangles, in the case where the lowest rank proc sees all the physical triangles as not well-oriented. This would cause the data relative to normal vectors not to be computed by any procs.
This update changes the owner assignement rule: owner is now the lowest rank proc among those who see the face as well oriented.
Added a function that check that among the whole mesh, every parallel edge has one and only one owner.

[codecov]

Codecov Report

Attention: Patch coverage is 77.41935% with 7 lines in your changes missing coverage. Please review.

Project coverage is 63.07%. Comparing base (f8a5338) to head (c1d4939).

Files	Patch %	Lines
src/analys_pmmg.c	77.41%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #116      +/-   ##
===========================================
+ Coverage    63.06%   63.07%   +0.01%     
===========================================
  Files           46       46              
  Lines        18920    18947      +27     
  Branches      3532     3541       +9     
===========================================
+ Hits         11932    11951      +19     
- Misses        6066     6071       +5     
- Partials       922      925       +3     

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[Algiane]

Thanks!