Fix a bug in the mmg2d API:

if the MMG2D_mmg2dmesh function was called in a loop where only the memory associated to triangles and edges was freed (MMG2D_Free_triangles, MMG2D_Free_edges functions), the library was failing with an error message about a lack of memory.

This hotfix includes:

  - a bug correction in the simultaneous reduction of matrices used in the mmg2d gradation;
  - the hmin/hmax truncature for anisotropic adaptation with mmg2d;
  - a bug correction in the mesh saving for mmg2d (the number of edges was false);
  - add forgotten unscaling when the mmg2d library fails;
  - a bug correction in the metric definition at ridges (anisotropic adaptation with mmg3d);
  - size truncature at hmin/hmax for the internal points an the regular surface points for anisotropic adaptation with mmg3d;
  - missing getters for the mmg2d API;
  - a bug correction in the precision of computation in eigenv file.

It changes:
  - the MMG2D_loadSol interface (remove a useless argument).

Release/5.1.0-beta1

This release adds :
  - the mmg2d application and library (for bidimensional mesh generation and isotropic/anisotropic mesh adaptation);
  - the anisotropic mesh adaptation for mmg3d and mmgs;
  - the mmgs library (API + mmgslib function);
  - the mmg3dls library function corresponding to the -ls option of mmg3d (allow to discretize an implicit surface);
  - manpages for the mmg2d, mmgs and mmg3d application (available in the doc/man directory);

It modifies the mmg3d library API:
  - the API functions are now prefixed by MMG3D instead of MMG5;
  - the 'MMG3D_Init_mesh' and 'MMG3D_Free_all' functions takes now a variable number of arguments. Please, refers to
The documentation to see how to call it.

Merge branch 'hotfix/5.0.3'

Patch error in previous commit : include file for example of using th…

…e mmg3d library in fortran.

Hotfix 5.0.2:

- Change the location of header file installation ('include/mmg/mmg3d' instead of 'include' directory).
- Thanks to P. Saramito: Now the library has a suitable 'soname'.
- Add contacts information to the AUTHORS file.
- Cleaner way to list header files.
- Add man pages + add info on memory usage and scotch rembering for the -val option.
5.0.2

Bug fix in saveMesh() for library version

Release 5.0.0

surface remeshing
isotropic mesh adaptation
implicit surface meshing (only mmg3d)

bug fix : initialisation of nq in the function loadmesh