Joe Dean

Add support for mixed-dimensional kernels (codimension 1)

1

This PR adds support for mixed-dimensional kernels of codimension 1. It requires [this](https://github.com/FEniCS/ufl/pull/265) PR to work. It would be nice to avoid passing `cell` to `analyse_modified_terminal`. Please let me know...

Orient mesh entities consistently and generalise `entities_to_geometry`

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In `main`, the orientation of mesh entities is defined by whichever cell appears last in the entity-to-cell connectivity. This assumption is relied on in a few places in the code...

[BUG]: `create_entity_permutations` occasionally segfaults for prism meshes

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### Summarize the issue Calling `create_entity_permutations` occasionally segfaults for prism meshes. For some reason, I can only reproduce this on a clean Ubuntu install, it seems to run without failing...

### Describe new/missing feature Currently, you cannot pass the coordinate element to the built-in mesh generators e.g. `create_box` or `create_rectangle` etc. This would be helpful when using tensor product elements,...