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Improve UMFPack vector chooser

Santiago Ospina De Los Ríos requested to merge feature/improve-umfpack-vector-chooser into master

UMFPack solver can handle nested matrices due to the use of flat-vector/matrix algorithms, however, the UMFPackVectorChooser does not reflect that (e.g., a range type of a BCRSMatrix<BCRSMatrix<...>> is a BlockVector<BCRSMatrix<...>>). This MR, simple makes the UMFPackVectorChooser more friendly to those nested types.

  • Solve nested type BCRSMatrix and FieldVector with recursion of UMFPackVectorChooser

  • Also, resolve the UMFPackCreator type with SFINAE on the UMFPackVectorChooser instead of arbitrary rules of the creator (the vector chooser already knows the rules, there is no need to repeat them)

  • Allow custom vectors in the UMFPack solver

  • Add README

Edited by Santiago Ospina De Los Ríos

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