[sigc] std::function<>-style declarations

I'd like to move libsigc++ gradually to a
  sigc::signal<void(int, Thing)>
syntax, instead of
  sigc::signal<void, int, Thing>
and for sigc::slot, because std::function has now established that. We
would deprecate the old syntax in libsigc++-2.0, but only remove it in

Objections or thoughts about how to do this with less code?

Murray Cumming
murrayc murrayc com

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