code: public static final void translate (Chain chain, Vector3d v) {
  
  		for (Group g:chain.getAtomGroups()) {
  			translate(g, v);
  		}
  	}
docs: Translates a chain object, given a Vector3d (i.e. the vecmath library
  double-precision 3-d vector)
  
  @param chain
  @param v