parameterization of peer prio and multitrust

[cheme]

Currently peer priority are a u8 (in enum Priority), and when used with wot peers, it generally is the same as the trust of the peer.
This allow some nice routing.
Yet we cannot have for instance two categories of trust and choice of peer based on first category for a key val, choice based on anothe for another one, because we got the notion of order from priority.
TODO
Parameterized this priority to PartialOrd so that we could have separate category and still a notion of order.
we can multi prio like (u8,u8), we also can non hierarchic prio, special prio and trustedkeyval prio!!!
For separate trust, we should simply derive (compose) som trust rules from existing rules.

[cheme]

Still an u8 but now we have an enum (multiprio should be simple to implement) with other states.