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This PR enables
variant="mimetic"for the de Rham complex on quads/hexes ("Q", "NCE", "NCF", "DQ").This is the element variant required for Low-Order-Refined equivalent preconditioners (a.k.a. connect-the-dots). See https://epubs.siam.org/doi/full/10.1137/22M1486534
The "Q" variant is just the tensor product of GLL. The DQ variant is the tensor product of basis functions dual to histopolation on the GLL subgrid. Histopolation degrees of freedom are integral averages on an interval, in this case between consecutive GLL nodes.
Supersedes FInAT/FInAT#54