Restructuring of Matrix and Vector and linear-algebra backends

Summary

Restructuring of Matrix and Vector and linear-algebra backends

Details

• Restructuring the vector and matrix backend wrappers
• Added init-finalize also for vectors
• Require gather/scatter operations instead of direct vector/matrix access
• Rewritten the interpolation
• Added ParallelIndexSet and DOFMapping to be used also in other backends

added 1 commit

• 4d9aeb2f - Removed runner from SolverInterface and Preconditioner from RunnerInterface

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added 2 commits

• e1ea842f - Removed SolverCategory and VectorState
• cfdbde8c - Add SymmetryStructure includes to MatrixBackends and remove changes from ellipt demo

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added 1 commit

• f7cc7c36 - removed BoundaryCondition from MR

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added 1 commit

• a6617120 - added ellipt demo corrections

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