anchor.diff:    IsSSortedList(nums); # force sort flag
   
     options := RecNames(OptionsStack[ Length(OptionsStack) ]);
  +  if "messfile" in options then
  +    Error("Option `messfile' deprecated: use `ACEoutfile' instead");
  +  elif "outfile" in options then
  +    Error("Option `outfile' deprecated: use `ACEinfile' instead");
  +  fi;
   
     MatchesKnownOption := function(knownoption, option)
       # Checks if option is a valid abbreviation of knownoption
  
positive.code:     fi;
    od;
                
    # Set the verbosity of the ACE output
    optval := GetOptionValue(fail, ["messages", "monitor"] );
    if optval<>fail and not stats then
      if IsInt(optval) and (optval<-1 or optval>1) then
        AppendTo(infile, "Mess:", optval, ";\n");
      fi;
      redir := "";
    else
      redir := "> temp";
    fi;
  
    # The user may wish to direct the ACE output to a file
    optval := GetOptionValue(fail, ["ao", "messfile"] );
    if optval<>fail then
      AppendTo(infile, "AO:", optval, ";\n");
      redir := "> temp";
    fi;
  
    AppendTo(infile, "AO:", ACEinfo.outfile, ";\n");
    AppendTo(infile, "End;\n"); # (one of) the ACE directives that initiate
                                # an enumeration
    if stats = false then
  
negative.code:     Print(" Subgroup generators : ", sgens, "\n");
    fi;
    
    GetOptionValue := function(defaultvalue, list)
      # Check among options (a CALL_ACE variable defined above) for any 
      # settings of the known option synonyms in list. The latest such
  