This is the function from the lib.structure.internal.coordinates module used to assemble common
atomic coordinate information, used by the structure.align, structure.atomic_fluctuations,
structure.com, structure.displacement, structure.find_pivot, structure.mean, structure.rmsd,
structure.superimpose and structure.web_of_motion user functions.
The non-functional lib.structure.internal.coordinates.common_residues() function has been removed as
the lib.sequence_alignment.msa.central_star() function performs this functionality correctly.
