Add demo of mixed Poisson problem #2502
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jhale
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This PR adds a demo of the mixed Poisson problem, closely following the one from the old DOLFIN.
https://fenicsproject.org/olddocs/dolfin/1.5.0/python/demo/documented/mixed-poisson/python/documentation.html
The boundary condition on the H(div) space is a bit unsatisfactory and would require facet expressions for a proper
solution on general meshes. The current approach is roughly how it is done in Firedrake.