New option -fem replacing -nofem

[corentin-prigent]

This update removes the option -nofem and adds a new option -fem which takes an integer as a parameter:

• -fem 0 mimics the exact behaviour of -nofem.
• -fem 1 is the default behaviour: mmg forces the output mesh to be finite element compatible.
• -fem 2 adds the option to also prevent the creation of regular boundary edges linking two features points (ridges or non-manifold). This stems from PR Force the split of regular boundary edges connecting ridge or non-manifold vertices #229.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.31%. Comparing base (4e2f535) to head (9e8eb0a).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #298      +/-   ##
===========================================
- Coverage    50.31%   50.31%   -0.01%     
===========================================
  Files          177      177              
  Lines        47881    47894      +13     
  Branches     10362    10368       +6     
===========================================
+ Hits         24093    24097       +4     
- Misses       16047    16054       +7     
- Partials      7741     7743       +2     

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