Merge branch 'fix/mpfa-static-iavolumehandle' into 'master'

[mpfa][fix] Use correct type for data member

See merge request !1642

dumux/discretization/cellcentered/mpfa/interactionvolumedatahandle.hh

@@ -100,7 +100,7 @@ protected:
 
     std::array< std::array<TMatrix, size2>, size1 > T_;             //!< The transmissibility matrix
     std::array< std::array<AMatrix, size2>, size1 > A_;             //!< Inverse of the iv-local system matrix
-    std::array< std::array<CMatrix, size2>, size1 > AB_;            //!< A_ left multiplied to B
+    std::array< std::array<BMatrix, size2>, size1 > AB_;            //!< A_ left multiplied to B
     std::array< std::array<CMatrix, size2>, size1 > CA_;            //!< A_ right multiplied to C
     std::array< std::array<OutsideTij, size2>, size1 > tijOutside_; //!< The transmissibilities for "outside" faces (on surface grids)
 };