Test Porp from local to local passed!

* Added some static methods to PorpAddress and PorpNode (.Local__) to
  provide easy access to the concept of a local address and node that
  lives at that address.
* Introduced Dto methods
    * Dtos have to be of type IPorpDto. I'm thinking of changing this to
      just object, so "dtos" won't have to be decorated. I don't think
      there is much gain in casting them to an interface. It's basically
      "this thing that you can save to/load from" and these save/load
      methods have to do the casting anyway.

Signed-off-by: William Raiford <bill.mybiz@gmail.com>