The `struct notification` lost type-safety, but avoided a redundant
string. The string is better, I think.
Since all notifications now contain an object of same name (some have
deprecated fields outside that), we can add helpers to do that, too.
Also, add some const (easy to do now we're typesafe!)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This table doesn't have `id`, except as the implicit one in Sqlite3,
so we need to add it for postgres.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
peer_htlcs has become a bit of a dumping ground: move listforwards
etc to its own file.
Also move `struct channel_info` from peer_htlcs.h to channel.h where
it more logically belongs.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
