Fix problems with extra triangles in input mesh

[corentin-prigent]

This update allows for the presence of extra internal triangles in the input mesh. Mesh packing would lead to incorrect triangle indices in the internal communicators.

[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.23%. Comparing base (c224b90) to head (48862c0).
Report is 15 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/libparmmg.c	60.00%	0 Missing and 2 partials ⚠️
src/analys_pmmg.c	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #110      +/-   ##
===========================================
+ Coverage    63.14%   63.23%   +0.08%     
===========================================
  Files           46       46              
  Lines        18962    18978      +16     
  Branches      3548     3553       +5     
===========================================
+ Hits         11974    12001      +27     
+ Misses        6060     6049      -11     
  Partials       928      928              

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[Algiane]

Is it just possible to add or modify a test so that it fails before the fix and is solved by the PR ?
Thanks by advance

[Algiane]

Thx