Import mesh from Gmsh

[dokken]

@Ariel_Lombardi

mesh2d = create_mesh(msh, "triangle")

This only creates a meshio mesh, not a mesh for usage in legacy dolfin. You would have to save this mesh to xdmf and then reload it, as done in Transitioning from mesh.xml to mesh.xdmf, from dolfin-convert to meshio - #176 by dokken