Replace mkl_operations::scale_sumN with GEN_SCALE_SUM
Replace thrust_algebra::for_eachN with GEN_FOR_EACH
Split GEN_SCALE_SUM operator() into own macro
Replace thrust_algebra::for_eachN with GEN_FOR_EACH
Replace viennacl_operations::scale_sumN with GEN_SCALE_SUM
Use environment variables for MTL/VEXCL paths