Fopen deals with non-ASCII filename paths on Windows.

spallart almaras is kinda working

No commit message

hope it is the last one ;-)

bug fixed in delaunay surface meshing with embedded edges
bug fixed in cross filed computation for non conformal mappings 

natural convection added in the incompressible code

a frame solver is made
changed INRIA MESH output
removed feaure in BL field
started to do MNT diagrams