anchor.diff:      newAntho
   
   let Simplify (antho : Anthology) =
  -    PaketParsing.UpdateSources antho.NuGets
  -    Install ()
  +    InstallPackages antho.NuGets
       
       let newAntho = SimplifyAnthology antho
       newAntho
  
positive.code:                       |> Map.toList
                        |> Seq.map (fun (k, v) -> k)
      allPackages |> Seq.iter GenerateTargetForPackage
  
  let Update () =
      let confDir = Env.GetFolder Env.Config
  
negative.code:     files |> Seq.map (fun x -> AssemblyId.from x) 
            |> set
  
  
  let InstallPackages (nugets : RepositoryUrl list) =
      PaketParsing.UpdateSources nugets
  
      let confDir = Env.GetFolder Env.Config
      Exec.Exec "paket.exe" "install" confDir
  