revert #7664 m_y convention #973

Job	Run time
Build extra components with Intel toolchain	16m 18s
Build without LCAO	4m 0s
Build without MPI	6m 14s
Build with Intel toolchain	6m 37s
Build without ELPA	8m 4s
Build without LCAO and MPI	4m 21s
Build with GNU toolchain	8m 1s
Build with CUDA support	9m 20s
Build extra components with GNU toolchain	18m 32s
	1h 21m 27s

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