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This PR implements
ConstantFESpace
, which represents constants defined on the whole domain.This type allows us, e.g., to impose the mean value of the pressure via an additional equation/unknown (i.e., a Lagrange multiplier).
In order to test it, by now, we have just applied the imposition of the mean value of the FE solution to that of the analytical solution of a Poisson problem with Dirichlet boundary conditions on the whole domain. As expected, in this particular case, the constraint does not have any affect on the FE solution, its just imposing something which is already fulfilled by the solution.