Refactor/merge openmp (#7446) #586

Job	Run time
Build with Intel toolchain	9m 29s
Build without LCAO and MPI	4m 1s
Build extra components with GNU toolchain	17m 42s
Build with GNU toolchain	8m 27s
Build without MPI	6m 2s
Build extra components with Intel toolchain	17m 58s
Build without LCAO	5m 24s
Build with CUDA support	14m 23s
Build without ELPA	7m 36s
	1h 31m 2s

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