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WIP: Implement the subIndex method for entities of all dimensions

Previously, it was available only for elements.

This merge request makes the strengthened test from !89 (closed) compile, therefore partially fixing #25 (closed) . The test will not run yet, because a few cases are still stubs.

The following question appears: what does the codim-parameter in

template unsigned int subIndex (const Codim::Entity& e, int i, unsigned int codim) const

mean? Is it the codimension wrt to the grid, or wrt to the entity e? I did not find this documented anywhere, and therefore made my own choice. The 'codim' in this patch is the codimension with respect to the grid.

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