Switch to OVLP_AMG_4_DG for all computations
With the switch to DUNE v2.6, proper static blocking was introduced (see #68 (closed) !53 (merged)) which changed the performance of the
OVLP_AMG_4_DG linear solver significantly. @oklein reports that it achieves similar speeds as
SuperLU even for small problems and is significantly faster for larger problems.
Remove the runtime switch for the linear solver and only use
OVLP_AMG_4_DG for any computation.
How to test the implementation?
See #68 (closed)