Fix: quiet search of SCOTCH, add template for issue creation and fis …

…missing header.

Fix bugs when building Mmg with int64 bit integers.

Update release number and date.

Fix last SQ bugs.

Update release number.

This release includes:

  - various bug fixes;
  - the robustification of isosurface discretization, more particularely in multi-material mode;
  - internal modifications of the analysis to support the parallel surface analysis in ParMmg.

This release patch fixes:

  - a memory error and a bug when using Scotch in Lagrangian mode (mmg3d);
  - an error when splitting boundary edges in lagrangian mode (mmg3d);
  - a regression when computing the available memory on large memory computer (mmg3d);
  - a possible NaN creation in optimLES mode.

This release patch fixes:

  - compilation errors when building on platform where char is unsigned (ARM for example)
  - a regression in isovalue discretization mode (leading to topological errors)

Patch regression in level-set mode: chkmanicoll was not calld anymore…

… on classical bdy edges (inside chkcol_bdy), it was called only along non-manifold edges.