Mesh_3 - add surface_only() named parameter

[janetournois]

Summary of Changes

Add the option surface_only() to make_mesh_3(), to completely skip the "refine_cells" part of Mesh_3, and cancel perturbation and exudation.
@soesau and I noticed that scanning cells, even in the context of "Surface mesher", takes a lot of useless time.

@soesau you can use this branch for your benchmark

@lrineau do you think surface_only should be a member of Mesher_3 or a parameter of Mesher_3::refine_mesh() (as done here)?

Todo: documentation

Release Management

• Affected package(s): Mesh_3
• Feature/Small Feature (if any):
• Link to compiled documentation (obligatory for small feature) wrong link name to be changed
• License and copyright ownership: unchanged

[sloriot]

no diff in the PMP header?

[afabri]

We could also have a function named make_surface_mesh()

[janetournois]

no diff in the PMP header?

I think it's not needed here. It's a parameter function like features() or mesh_3_dump()

[sloriot]

no diff in the PMP header?

I think it's not needed here. It's a parameter function like features() or mesh_3_dump()

OK I thought that you would need to pass the option in the call to make_mesh_3() here.