//! bd's rows and herdr's panes, joined into the snapshot the view draws.
//!
//! One module for the vocabulary both sides are held in, one for what nests
//! what among the rows, one for what each row is tied to, one for the join
//! itself, one for the rules that read a disagreement out of it, one for the
//! badge a row carries beside its title, and one for the snapshot they all
//! assemble into.