code: def versions(mode=None, add_pckg=None, ncol=4):
      r
      # Issue warning
      mesg = ("\n    Func `versions` is deprecated and will " +
              "be removed; use Class `Versions` instead.")
      warnings.warn(mesg, DeprecationWarning)
  
      return Versions(add_pckg, ncol)
docs: r"""Old func-way of class `Versions`, here for backwards compatibility.
  
      ``mode`` is not used any longer, dummy here.