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Fix Null and Diagonal preconditioner operator implementation and add test

Jacques Xing requested to merge CFD-Xing/redesign-prototypes:precond-operator into master
  • Fix null preconditioner implementation for local space
  • Fix diagonal preconditioner implementation for local space
  • Create a tests/init_nullpreconfields.hpp subclass to reduce code duplication.
  • Create a tests/init_diagpreconfields.hpp subclass to reduce code duplication.
  • Consistently add test for seg, quad, tri, hex, prism, pyr, and tet.
  • Use Nektar++ for reference solution.

Remark: Current implementation of the diagonal preconditioner is very inefficient.

Note: MR!48 should be merged first

Edited by Jacques Xing

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