Merge branch 'fix-eigen-cg-solver-backend' into 'master'
Make EigenBackend_CG_Diagonal_Up work in a StationaryLinearProblemSolver
See merge request !333 (merged)
(cherry picked from commit 9b66942c)
89b2f9f5 Test: does EigenBackend_CG_Diagonal_Up work in a StationaryLinearProblemSolver? 989742e0 [backend] don't call native methods in the generic backend functions