Mesh refinement options
Develop a new mesh refinement options within DIF3D, PROTEUS and Griffin that would look like this:
max_axial_mesh_size = 0.1 % always required
refined_axial_mesh_option { lower_surf = surf_name upper_surf = surf_name max_axial_mesh_size = 0.05 } % optional - can be provided as many times - but with caution (need to check that surfaces are not overlapped and that lower surface is below upper surface