Draft: Hierarchical Lagrange basis with element bubble function
Summary
Similar to the HierarchicalLagrangeBasis there is a hierarchical basis with element bubble functions implemented in dune-localfunctions. This MR makes this available to dune-functions and implements the Stokes problem with a combination of P2+B3 for the velocity and discontinuous P1 for the pressure.
Requirements
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Need core/dune-localfunctions!257 (merged) to be merged before
Edited by Simon Praetorius