This pointer is not used. Therefore it is now deleted. The solve_minimization function used in local problem is not exaclty the same as the one required in vprime function. Therefore, a new version of solve_minimization will be separately added directly into the class FemDxEQS_GIAReduct.h
adding minimization solve function directly into the FemDxEQS_GIAReduct class, and using it in vprime function.
Notice that this minimization solve function takes matrix form RHS.