Revise d2v and v2d maps

[Jan Blechta]

Revise dof_to_vertex_map and vertex_to_dof_map functions after

1. switching to local DOF indexing
2. introduction of ghost mesh entities

For instance, dof_to_vertex_map (which is contiguous array) does not contain unowned dofs due to prior global dof indexing. This can change now. Also interaction with ghost meshes was questioned in #493.

[Martin Sandve Alnæs]

It would be great to have these generalised for mesh entities of any dim.

[Jan Blechta]

It would need changing the current semantics: working exclusively on the space having just vertex dofs makes dof_to_vertex_map contiguous and one-to-one (when modulated by num_dofs_per_vertex). Something like this does not make a sense for dof_to_facet_map as there is no exclusively-facet space (so far).

On the other hand "inverse" map facet_to_dof_map could still have a sense. But it then becomes more complex how to modulate it for multiple dofs on one entity.

Is GenericDofMap interface insufficient for you? Or do you have any more concrete suggestion?

[Jan Blechta]

Fix in next d460a32

[Jan Blechta]

Extending to unowned filed as a separate issue #536.

[Jan Blechta]

19aafd7

[Martin Sandve Alnæs]

Removing milestone: 1.6 (automated comment)