Provide functions that compute information about reference element
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mscroggs commented
Currently various geometry data is computed by FFCx in FEniCS/ffcx#335. These are:
- normals of facets of reference
- orientations of normals (inward or outward)
- Volume of reference
- Volume of reference's facets
- Vectors of edges of cell
- Vectors of edges of cell's facets
In particular, it would be very useful for Basix to provide the user with the normals to facets (and orientations) and the volume of a reference, as these are a little involved to compute. The others are easy enough to calculate so can probably stay in FFCx.