removed a lot obsolete code

src/amdis/linear_algebra/LinearAlgebraBase.hpp

src/amdis/linear_algebra/LinearSolverInterface.hpp

src/amdis/linear_algebra/Mtl.hpp

src/amdis/linear_algebra/PreconditionerInterface.hpp

src/amdis/linear_algebra/RunnerInterface.hpp

src/amdis/linear_algebra/mtl/BITL_Preconditioner.hpp

src/amdis/linear_algebra/mtl/BITL_Solver.hpp

src/amdis/linear_algebra/mtl/BlockMTLMatrix.hpp

src/amdis/linear_algebra/mtl/BlockMTLVector.hpp

src/amdis/linear_algebra/mtl/CMakeLists.txt

src/amdis/linear_algebra/mtl/Copy.hpp

src/amdis/linear_algebra/mtl/DOFMatrix.hpp

src/amdis/linear_algebra/mtl/DOFVector.hpp

src/amdis/linear_algebra/mtl/ITL_Preconditioner.hpp

src/amdis/linear_algebra/mtl/ITL_Solver.hpp

src/amdis/linear_algebra/mtl/KrylovRunner.hpp

src/amdis/linear_algebra/mtl/LinearSolver.hpp

src/amdis/linear_algebra/mtl/MTLDenseVector.hpp

src/amdis/linear_algebra/mtl/Mapper.hpp

src/amdis/linear_algebra/mtl/Preconditioner.hpp