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lowest order C^1 space

Andreas Dedner requested to merge feature/order2C1space into master

Implement lowest order C^1 space. Needs order=3 and testSpaces = [[0, 0], [-1, -1], [-1]]. In addition to some other minor changes this adds a laplace constraint to the value projection because otherwise we have fewer dofs than the dimension of P^3: int laplace Pi^0 v = int_boundary v.n

Builds on div-free space and requires dune-fem feature/improvePythonQuadPoints branch.

Edited by Andreas Dedner

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