Removed the code for entity orientations in the unstructured mesh
It was unused, untested and unnecessarily complicated. We will deal with entity orientations when it is actually needed. I think that the implementation based on storing the whole permutations of subentity indices is not appropriate anyway - it induces huge memory consumption, while e.g. for faces we are interested only in the orientation of the outward normal vector with respect to the two adjacent cells, which can be stored as one bit per face-cell pair, or it can be deduced from the entity indices if we enforce a suitable convention (e.g. all normal vectors could be outward with respect to the adjacent cell with the smallest index). I think OpenFOAM uses a similar convention for normal vectors. As for the orientation of edges in 3D, I have no idea where it could be useful...
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