test: add nspin=4 magnetization round-trip regression test #975

Job	Run time
Build extra components with GNU toolchain	14m 12s
Build without LCAO and MPI	4m 28s
Build without LCAO	5m 4s
Build without MPI	4m 57s
Build with CUDA support	12m 29s
Build with GNU toolchain	5m 31s
Build without ELPA	8m 15s
Build extra components with Intel toolchain	18m 59s
Build with Intel toolchain	8m 44s
	1h 22m 39s

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