laetitia-m

Ensure that required triangles are preserved

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**This PR** 1. Fix a bug introduced by PR #239 2. Improve comments **Explanations of 1.** A bug was introduced by PR #239: triangles required by the user in the...

(1) Change tag type (int -> uint) and (2) creation of the overlap

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1. The type of tag was signed integer `int`, and in now unsigned integer `uint`. This was needed to be able to add the extra tag `MG_OVERLAP` 2. Creation of...

Snap val for level-set discretization `PMMG_snpval_ls`

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**WARNING** not to be merged for now because: - Not fully finished and tested yet - need to properly transfer data - Need to have mmg [PR#280](https://github.com/MmgTools/mmg/pull/280) and ParMmg [PR#123](https://github.com/MmgTools/ParMmg/pull/123)...