Revert atom_pair.cpp and hcontainer.cpp splits #1392

Job	Run time
Build extra components with Intel toolchain	17m 27s
Build without MPI	6m 43s
Build extra components with GNU toolchain	18m 21s
Build with Intel toolchain	8m 33s
Build without ELPA	8m 8s
Build with CUDA support	11m 52s
Build without LCAO	5m 56s
Build without LCAO and MPI	4m 35s
Build with GNU toolchain	8m 10s
	1h 29m 45s

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