Change Poisson test case for MFEM.
Use new flux BC to create a nonlinear pressure field. Allow for higher order RT and BDM elements. Working: 2D: RT0 x P0, RT1 x P1, BDM1 x P0, BDM2 x P1 3D: RT0 x P0 Not working: 2D: RT2 x P2 - solver does not converge. 3D: RT1 x P1 - fluxes in z direction are not continuous. Rest looks good. 3D: BDM1 x P0 - no interpolation provided by dune-localfunctions.
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