Printing in Duplex modes.

Some printers have more han 2 duplex modes so he Boolean property won't do.
This is a major change requiring a rebuilding of the libaries.

1. In qrprntr.pas change ALL Duplex properties to 'Integer'.

2. In GetPrinterSettings
  procedure GDuplex; { Duplex }
  begin
    if Supported(dm_duplex) then
      FDuplex := DevMode^.dmDuplex;
  end;
3. In ApplySettings

  if Supported(dm_duplex) then
  begin
    SetField(dm_duplex);
    DevMode^.dmDuplex := FDuplex;
  end;
4. Rebuild Qrpt50.dpk and Dclqrt50.dpk ( 60 for D6).