Merge topic 'improve_polyhedral_contouring'

49284637 from 'char ** argv' to 'char *argv[]' to prevent link error on Windows
cc9ec248 Minor changes to get rid of -Wunused and -Wformat compiler warnings
f47a0534 added a second test (TestPolyhedron3)
1b113aec added correct parentheses to value tolerance calculation
e45d98a7 added test for improved polyhedral contouring
d90a9cf8 improved the polyhedron contour using tolerances dependent on the data range

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Utkarsh Ayachit <utkarsh.ayachit@kitware.com>
Merge-request: !1563