code: public static QuatSymmetryResults calcGlobalSymmetry(Structure structure,
  			QuatSymmetryParameters symmParams,
  			SubunitClustererParameters clusterParams) {
  		Stoichiometry composition = SubunitClusterer.cluster(structure, clusterParams);
  		return calcGlobalSymmetry(composition, symmParams);
  	}
docs: Calculate GLOBAL symmetry results. This means that all {@link Subunit}
  are included in the symmetry.
  
  @param structure
  protein chains will be extracted as {@link Subunit}
  @param symmParams
  quaternary symmetry parameters
  @param clusterParams
  subunit clustering parameters
  @return GLOBAL quaternary structure symmetry results