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Replace LFEMatrix with DynamicMatrix

Simon Praetorius requested to merge feature/densevectorview into master

Summary

In this MR the class LFEMatrix is replaced by a DynamicMatrix from dune-common. The reason for this is to unify the data-structures. Also, optimizations already introduced or in plan for dune-common get automatically included in dune-localfunctions. It increases maintainability and safety.

ToDo

  • Check whether there is some performance regression -> I do not see big differences.
  • With DynamicMatrix the code could be improved in a lot of places, by using .mv() or transposed() or... This can be done in another MR.

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Edited by Simon Praetorius

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