Section 7, add reference to 6top sublayer indicating statistics requirement

[Xavier Vilajosana]

• Section 7 : I am left wondering how the neighbor information maintained by a node/mote affects interoperability. A brief sentence or two would go a long way to motivate this section.

TW> Agreed. This sentence should go in the intro paragraph of Sections 7.1. TW> Something like this: TW> "Future version of the 6top Protocol [LINK] might require those statistics." TW> @Editor, please add that sentence.

[Xavier Vilajosana]

6p link requires 6p to be adopted by the WG