Fixed tetgen packaging on Mac OS.
[IO] Use vtkSmartPointer on construction.
[MGTL] Delete _mesh_nodes_along_surfaces in dtor too.
Merge pull request #540 from endJunction/FixMemoryLeaks

Fix memory leaks
Added some badges to the Readme.
[DE] Remove unused vars in RequestInformation().
[DE] Correct initialization order in SaveMeshDlg.
[ML] Comment unused function argument.
[IO] Remove unused variable.
ShapeLib: correct unsigned < 0 comparison.

Comparison of unsigned expression < 0 is always false.