docs: def renumber_system(self, offset):
          """
          The residue numbers of the protein can be reformated in case of misallignment with the convention.
              Takes:
                   * offset * - a number that represents by how many residues the numbering has to be shifted.
          """
  
          self.universe.protein = self.universe.select_atoms("protein")
          self.universe.protein.residues.resids = self.universe.protein.residues.resids+int(offset)