Structs derive PartialEq but not Eq

[gcomte]

What's the reason behind some structs deriving PartialEq but not Eq? Particularly I would need Eq to be derived for lightning::chain::WatchedOutput.

[TheBlueMatt]

I don't think there's a specific reason, we should probably derive Eq for ~all the traits we impl PartialEq for. Labeling "good first issue" cause it should be easy for a new contributor to do.

[gcomte]

What clippy says about that issue: https://rust-lang.github.io/rust-clippy/master/index.html#derive_partial_eq_without_eq